phsyics FINAL
when a star collapses to form a black hole it's Mass... Remains the Same, decreases, increases?
Remains the Same. a black hole is a star that becomes so small the gravitational force is so strong that light cannot even escape the mass has not changed
a bullet fired from a rifle begins to fall... As soon as it leaves the barrel, after are friction reduces speed, neither of these?
as soon as it leaves the Barrel (g works immediately)
the satellite describes an elliptical orbit about a planet. In which position is the satellite traveling the slowest? (pic #30 ch 10)
at Point a farthest away because there's greater PE so less kinetic energy
when twirling a skater brings her arm inward her rotational speed... Increases, Remains the Same, decreases?
increases because rotational speed is RPM (easier to rotate b/c mass not distributed rather it's near the axis)
Newton discovered... Gravity, that gravity is universal, neither?
that gravity is universal
which of these three produces the greatest tidal effect on you right now... The Sun, the moon, the Earth?
the Earth**
which is most responsible for the ocean tides... the Sun, the moon, both contribute equally?
the Moon because has greater gravitational pull on both sides of the Earth stretching it the moon is closer and distance from one side to the other closer distance means greater the force.
how much torque is applied to an object if the force is 10 Newtons in the lever arm is 5 m long... 1/2, 2, 50, 250, 500?
torque= lever arm distance X Force--> so 5 x 10=50
according to Newton doubling the distance between two interacting objects... Divides by 4 the gravitational force between them, multiplies by 4 the gravitational force between them, divides by 2 the gravitational force between them, multiplies by 2 the gravitational force between them?
/ for the gravitational force between them because of the inverse Square law intensity is proportional to 1 / distance squared
what is the approximate mass of a 1 square centimeter column of air that extends from sea level to the top of the atmosphere? 1 gram, 1 kilogram, 10 kg, 100 kg?
1 kg because air has weight for any one centimeter square column 1 kg is the weight which is equal to 10 Newtons
1 liter of water has a mass of... 1 kg, 1 Newton, both of these, neither of these?
1 kg because one lie equals 1 kg equals 1 Newton$
which takes longer to increase by 10°C using the same heat source? they are all the same, 1 kg of water, 1 kg of gold, 1kg of copper?
1 kg of water because water has a high specific heat (think of boiling water comapred to boiling the other materials-which one boil first?)
a 1-ton blimp hovers in the air. The buoyant force acting on it is... Less than 1 ton, 1 ton, more than one ton, zero?
1 ton because of Archimedes principle an object and air is buoyed up with a force equal to the weight of air displaced
buoyant force is greater on a submerged... 10 Newton block of lead of, 10 Newton block of aluminum, is the same on each?
10 Newton block of aluminum because aluminum is lighter than lead so it takes a larger amount to get 10 Newtons so it displaces more water do to a greater volume even though they're the same weight
what is the buoyant force acting on a 10 ton ship floating in the ocean...more than 10 tons, less than 10 tons, depends on the density of sea water, 10 tons?
10 tons because Archimedes principle$: an immersed body is buoyed up by a force EQUAL to weight of fluid it displaces
at what temp. does water boil on the celcius scale? 100, 273, 212, 32, 0?
100
what is the weight of water displaced by 100 ton floating ship? more than 100 tons, less than 100 tons, 100 tons, 100 cubic meters, depends on the ship shape?
100 tons because according to principle of floatation a floating object displaces a weight of fluid equal to its own weight
consider a monkey wrench released at the far edge of the Solar System. Suppose that its drops by virtue of only Earth gravity. It will strike the surface with a speed of about... 9.8 meters per second, 8 kilometers per second, 11 km per second, the speed of light?
11 km per second because that is the escape speed search Escape From Earth out of elliptical orbit takes 11 km per second yeah it's if someone were to get away from the Earth and go out to Eternity and drop object to the Earth it would hit the Earth at 11.2 km per second making it I'm your trip Max possible speed to hit the Earth by gravity alone
a rock suspended by a weighing scale weighing 5 Newtons out of water and 3 Newtons when submerged in water what is the buoyant force on the rock? 8 Newtons, 5 Newtons, 3 Newton's, to Newton's, none of these?
2 Newtons because the buoyant force up is 2 and the weight down is five so you subtract
how many different elements are in a water molecule? 1, 2, 3, 4, none of these?
2 you have hydrogen two atoms of hydrogen and oxygen one atom
it would be harder to pull evacuated magdenberg hemispheres apart when they are... 20 km beneath the ocean surface, at sea level, 20 km above the ocean surface, held upside down?
20 kilometers beneath the ocean surface because pressure increases with depth in the weight & water weight over head incraeses pressure like your inability to snorkel more than a meter deep because air at the surface will not freely enter the high-pressure region in the compressed lungs. SO MUCH WEGHT ABOVE YOU CAN'T PULL APART (what causes them to stay together? atmosphereic pressure, weight of the atmosphere)
at what temp. does water freeze on thr Kelvin scale... 0, 273, 212, 32, 100?
273 *
protons and neutrons contain how many quarks in each? One, two, three, four, five?
3$
the temperature at the bottom of Lake Tahoe High in the Sierra Nevada mountains in California at this moment is... Above 4 degrees Celsius, below 4 degrees Celsius, 4 degrees Celsius, uncertain?
4 degrees C because water has a high specific heat the lake experiences freezing temperatures part of the year so has 4 degrees Celsius water in it for sure which makes the colder water sink to the bottom.
Before ice can form on a lake all the water in the lake must be cool to... 0 degrees Celsius or 4 degrees Celsius?
4 degrees Celsius the whole entire lake must reach 4 degrees THEN and only then can crystals form at the top and become less dense
what is the atomic weight of a single carbon dioxide molecule CO2? 14 AMU, 44 Amu, 3 Amu, 22 Amu?
44 Amu carbon has an atomic mass of 12 + oxygen has atomic mass of 15.9 rounded to 16 x 2 Accounting 402 equals 44
at what temp. is water most dense? 4 °C, 0°C, -4°C, 8°C?
4°C contacted as much as it can less volume more weight density
the flight of a blimp best illustrates... The new Leaf, Archimedes principle, Pascal's principle?
Archimedes principle because this state's the weight of the volume of water displaced equals the buoyant force which enables things to hover
airplane flight best illustrates... Boyle's Law, Bernoulli's principle, Pascal's principle, Archimedes principle?
Bernoulli's principle because this principle states when the speed of a fluid increases internal pressure and fluid decreases. an airplane wing acts like a roof because as the wind blows across the top of the roof the roof wants to rise because internal pressure of the moving air against the top of the roof is less than that Miss fear pressure beneath it so the high atmospheric pressure presses into the area of low pressure. This Lifting for supports heavy aircrafts. great pressure below pushes the wing into region of less pressure above. wings are designed so that air is made to flow faster over the top of the surface then under the lower surface so air flows faster over the top just like flows faster through narrow pipe. this creates and that net upward force on the airplane.
three holes are drilled into a water tower which is filled with water at the position shown. Water will spurt the greatest horizontal distance from the hole... A, b, c, the horizontal distance will be the same for all three holes? (pic #15 ch.13)
C at the very bottom because pressure increases with depth
an object is placed exactly halfway between the Earth and the moon the object will fall towards... Earth, Moon, neither of these?
Earth because it has more mass meaning it has greater force period mass and force our proportional greater mass wins.
atmospheric molecules do not fly off into outer space because of... Earth gravitation, the relatively high speeds, cohesive forces, the relatively low densities?
Earth gravitation keeps the molecules from flying off even though they have great kinetic energy
an object is least stable if it has... High center of gravity and wide base, low center of gravity and narrow base, large mass and wide base, High center of gravity and narrow base, low center of gravity and wide base?
High center of gravity and narrow base you want a low center of gravity and a wide base
a temperature difference of 10 degrees Celsius is also equal to a temperature difference of 10 on the... Fahrenheit scale, Kelvin scale, both of these, neither of these?
Kelvin scale
which has the greatest atomic mass? iron, neither they have equal Mass, Krypton?
Krypton because on the Periodic Chart Krypton atomic mass is 83.80 while iron has 55.8 Amu
when an ice cube in a glass of water melts the water level... Remains the Same, Rises, Falls?
Remains the Same because the ice cubes are still just placing the same amount of water they were when they were unmelted
what is the smallest particle listed below... A quark, a proton, a neutron, an atom, a molecule?
a cork because it makes up the protons and neutrons of an atom
which would do a better job of keeping you warm @ night if they are the same temp... a hot 10 Kg iron brick, there would be no difference, 10 K bottle of hot water?
a warm bottle of hot water because water has high specific heat (thermal inertia)- has great resistence to change in temp
a satellite near the earth makes a full circle in about an hour & a 1/2. How long would a satellite located as far away as the moon take to orbit the Earth... About 28 days, the same hour and a half, less than an hour and a half, more information about the satellite is needed, none of these?
about 28 days because the moon lunar months is 28 days
a column that extends from the sea level to the top of the atmosphere contains a certain mass of air. IF the same column instead had the same mass of mercury in it, the height of the Mercury column would be... 1 / 13.6 times the height of the atmosphere, about 3/4 of about 30 in, 10.3 M about 34 ft, about 5.6 km?
about 3/4 of about 30 in. Mercury is 13.6 times heavier than water so the atmosphere cannot hold as much of mercury up. the atmosphere pressure is only having enough to support 34 feet on a normal day water can rise in a barometer sixty inches. Mercury is 2 times the density so half the height so on a normal day Mercury can only rise 30 in.*
about how high can water be theoretically lifted by vacuum pump at sea level? About 30 in, about 9.8 feet, about 34 ft, about 30 km?
about 34 feet. are above us has a certain weight and it is heavy enough to support a column of air equal to 34 feet of water. Airweight in the container of water weight must equal. The downward weight equals the pressure that pushes in all directions.
an umbrella tends to move upwards on a windy day principally because... Buoyancy increases with increasing wind speed, air pressure is reduced over the curve top surface, air gets trapped under the umbrella warms and Rises?
air pressure is reduced over the curved top surface and according to Bernoulli's principle there is reduced pressure over the top and still greater pressure under the umbrella so they high pressure pushes into the area of low pressure.
the air in this room has... weight, energy, Mass, all of these, none of these?
all of these because air has weight that's why we have atmospheric pressure and if something has way too then it has to have mass and everything has mass and the molecules have kinetic energy
the period of a satellite, the time it takes for a complete Revolution, depends on the satellite... Altitude, weight, Mass, all these, none of these?
altitude because the more potential energy have the less kinetic energy you have so you will go slower and it will take longer to orbit
if an astronaut landed on a planet made of antimatter, there would be an explosion as both astronaut and... An amount of Planet matter equal to that of the astronaut would annihilate, the planet would be annihilated releasing energy according to the Formula E equals MC squared, none of these?
an amount of Planet matter equal to that of the astronaut would annihilate because when antimatter opposite of matter comes into contact they are annhilate each other and cancel out the same amount and becomes Pure Energy
a positron orbiting an antiproton would make up an atom of... unobtainium, positronium, anti hydrogen, antihelium?
anti hydrogen
In which position does the satellite have minimum potential energy? (ch 10 pic #31)
at Point C because it is closest so decrease in P E equals an increase in ke
at which position is the satellite at the perigee? (#33 pic ch10)
at Point C because perigee means pretty close
A satellite describes a circular path about a planet. At which of the two positions is the satellite traveling faster? (pic ch.10 #28)
at both positions in a circular path the speed is the same at both points A and B because a circular orbit does not change and ke, PE, speed
pour a liter of water at 40 degrees C into a liter of water at 20 degrees C & the final temperature of the two becomes... Less than 30 degrees Celsius, at or about 30 degrees, more than 30 degrees Celsius?
at or about 30 degrees because you put the two together and they're equal quantities so they will meet in the middle!
at which point is gravity doing work on the satellite? (pic #32 ch 10)
at point B not at the perigee or apogee@
a phonograph record player has constant rotational speed. The speed of the record relative to pick up beetle is lowest... Everywhere because of the same speed anywhere in the record, at the beginning of the record meaning towards the edge, or at the end of the record meaning towards the center?
at the end of the record towards the center because the the more you move out from the center of the faster you go (greater tangential speed) (speed is 0 @ the center so decreasing in speed closer to center)
a swimmer cannot snorkel more than a meter deep because air... In the lungs cannot easily be expelled, is buoyed up leaving the swimmer breathless, at the surface will not freely enter the higher pressure region in the compressed lungs, tends to liquify in the snorkel tube?
at the surface will not freely enter the higher pressure region in the compressed lungs. There is so much water above you the weight of the atmospheric pressure increases as you go down because pressure increases with depth. the weight of the air is always pressing in on you 15 pounds per square inch but this is not enough to overcome the greater pressure of the water above you that squishing in on you. the low pressure of the air will not enter the high pressure Where You Are. high pressure only presses into areas of low pressure. (ALWAYS: AREA OF HIGH PRESSURE PUSHES INTO LOW PRESSURE-HIGH--->LOW)
Earth satellites are typically more than 100 km high so as to be above the Earth's... Atmosphere, gravitational fields, both of these?
atmosphere (cant't escape earth's gravity)
in drinking soda or water through straw we make use of... Bernouli's principle, capillary action, surface tension, atmospheric pressure?
atmospheric pressure because the weight of the air pushes the liquid up into the straw
a bubble of air released from the bottom of Lake... Ultimately expands and contracts as it rises, Rises to the top at constant volume, become smaller as it rises, becomes larger as it rises?
becomes larger as it rises and grows in the water because the streamlines get closer to each other and there's less internal pressure so greater speed and mass stays the same the volume increases and the density decreases according to Bernoulli's principle. Also remember pressure is proportional to density
as a helium filled balloon rises in the air it becomes... Heavier, more dense, bigger, all of these, none of these?
bigger because things expand when they rise
angular momentum is conserved for satellite in... circular orbit, elliptical orbit, both of these, neither of these?
both of these because angular momentum is always conserved no matter what. angular momentum is I x Omega
the pressure in a liquid depends on liquid... depth, density, both of these, neither of these?
both of these because pressure is equal to weight density X depth
in a vacuum an object has no... Mass, buoyant force, weight, temperature?
buoyant force. In a vacuum there is no air so an object cannot displace its own volume of air.
when an object is partly or wholly immersed in a liquid, it is buoyed up by... The force equal to its own weight, by force equal to the weight of liquid displaces, but nevertheless sinks, by a buoy?
by a force equal to the weight of liquid displaced. This is called the floatation principle a floating object displaces a weight of fluid equal to its own weight
the heat required to raise 1 gram of water one Celcius degree is called... joule, calorie, watergram, Calorie?
calorie not Calorie that would raise 1000 grams
compared to the mass of a hydrogen atom the mass of a carbon atom is... 8 times as great, 16 times as great, 12 times as great, appreciably more than 16 times as great?
carbon atom has a mass of 12 while a hydrogen has a mass of 1
surface tension is a direct result of... viscosity, cohesive forces between molecules in a liquid, Archimedes principle, adhesive forces between molecules in a liquid or solid, Bernoulli's principle?
cohesive forces between molecules in the liquid because the molecules tend to cling to each other and do not want to touch anything else so they form little balls and a protective skin covering
aluminum has a specific heat capacity more than twice that of copper. Place equal masses of aluminum and copper wire in a flame and the one to undergo the fastest increase in temperature will be... Aluminum, copper, both the same?
copper because aluminum has a higher specific heat meaning it resist changes in temperature will copper has a low specific heat so it's quickly changes in temperature.
when a bimetallic bar made of copper and iron strips is heated, the bar bends towards the iron strip. The reason for this is... Iron gets hotter before copper, copper expands more than iron, copper gets hotter before iron, iron expands more than copper, none of these?
copper expands more than iron. as temperature increases materials expand.
if a piece of sheet metal is cut in the shape it's center of gravity is most likely at... A, b, c, d?
d* (#20 pic Ch 8)
consider a sample of water at 0 degrees celsius. If the temperature is slightly increased the volume of the water... Increases, Remains the Same, decreases?
decreases because 0° to 4 degrees Celsius in temperature is increased it will contract rather than expand
if glass expanded more than Mercury then the column of mercury in a mercury thermometer would rise when the temperature... Decreases, increases, neither of these?
decreases because it is the opposite of what happens usually a Mercury because it is a liquid heats up quicker so we can see the temperature.
on a windy day atmospheric pressure... Decreases, increases, remains unchanged?
decreases because of Bernoulli's principle as air blows across surfaces pressure decreases
consider a sample of ice at 0 degrees celsius. If the temperature is decreased the volume of the ice... Decreases, increases, stays the same?
decreases. ice from 4 degrees Celsius to 0 degrees Celsius does the opposite of what you think but only in that range from 0 and below it follows what normally what happened as temperature decreases things contract.
as a high-altitude balloon Rises higher and higher into the atmosphere it undergoes a decrease in... Mass, density, weight, volume, none of these?
density because as as it rises expands so volume is increasing which means there's less pressure and pressure is proportional to density so blast pressure equals less density
a car travels in a circle with constant speed. The net force on the car is... 0 because the car is not accelerating, directed forward and the direction of travel, none of these, directed towards the center of the Curve?
directed towards the center of the Curve
tangential speed is directly proportional to...
distance
when a gas in a container is squeezed to half its volume and the temperature Remains the Same, the gas pressure... doubles, halves, quadruples, Remains the Same?
doubles . according to Boyle's Law pressure and volume are inversely proportional half the volume means double the pressure.
when a gas in a container is qqueeze to half of its volume its density.... quadruples, Remains the Same, halves, doubles?
doubles. according to Boyle's Law pressure and volume are inversely proportional while density and pressure are proportional. Half the volume means two times the pressure and because pressure is proportional to density this means two times the density.
which of the following has a negative electric charge? electron, Neutron, proton?
electron has a negative charge proton has a positive charge and a neutron has no charge.
the chemical properties of matter come mostly from its... Neutrons, protons, electrons?
electrons because electrons are an electron shells and the outer layer of electrons reacts with other atoms
in an electrically neutral atom the number of protons in the nucleus is balanced by an equal number of... Neutrons, electrons, quarks, all of these?
electrons because electrons are negative and protons are positive so they cancel each
a completely submerged object hovers in the water, neither sinking or Rising. Its density is... Less than the density of water, equal to the density of water, greater than the density of water?
equal to the density of water
when water at 4 degrees Celsius is heated it expands. When water at 4 degrees Celsius is cooled it... Expands, contracts, neither could contracts nor expands?
expands because as 4 degrees Celsius to 0 degrees Celsius as it gets colder it expands
blood pressure is normally greater in your... ears, feet, same in each?
feet because your body is a container pressure increases with depth
when a boat sails from freshwater to saltwater the boat will float... Lower in the water, at the same water level, higher in the water?
fire in the water because salt water is denser. think about the other question in think about the other question in which when add salt water to boil with an egg and egg floats.
when you touch a cold piece of ice with your finger energy flows... From your finger to the ice, from the ice to your your finger, actually both ways?
from your finger to the ice because energy leaves your finger to the ice. heat is a verb getting energy from one place to another because there is a difference in tempt always from warm to cold.
when carbon and oxygen atoms combine, energy is... Taken in by the reaction or given off by the reaction?
given off by the reaction + Co$*
which of these atoms has the greatest number of electrons? helium, gold, iron, carbon?
gold because it has the greatest number of protons are atomic number of 79 and protons are equal to the number of electrons
Escape speed from the Sun is a... Little same, greater then the Earth Escape speed?
greater because it is a lot more mass (more mass more g force more speed stay in orbit so to get out will take an even greater speed)
the slower a fluid moves, the... Greater its internal pressure or less it's internal pressure?
greater its internal pressure because of Bernoulli's principal. Bernoulli's principle explains as the speed of fluid increases its internal pressure in fluid decreases. think of the car illustration in traffic.
lobsters live in the bottom of the ocean the density of a lobster is... Equal to the density of seawater, less than the density of seawater, greater than the density of seawater?
greater than the density of seawater because they think they're not equal otherwise they hover if they were less they would float
water pressure is... The same against all surfaces, greatest against the sides of a submerged object, greatest against the bottom of a submerged object, greatest against the top of a submerged object?
greatest against the bottom of a submerged object that's why we have buoyancy pressure bottom is greater than on top the deeper you go the higher pressure so net upward Force
water that contains significant amounts of hydrogen with neutrons is called... Hydrogenated water, Hydro-nutrinide, heavy water, isotopic water?
heavy water Stillwater because the protons did not change protons or you need to element neutrons can change
some molecules are able to absorb large amounts of energy in the form of internal vibrations and rotations. Materials composed of such molecules have... low specific heat or high specific?
high specific Heats because it resists changes in temperature internal vibrations and rotations do not increase temperature only translational
from Earth one satellite appears to overtake another. The slower satellite is... Higher, lower, can't say?
higher because increase in speed means a decrease in potential energy which means a decrease in altitude
compared to a giant Iceberg a hot cup of coffee has... greater specific heat and more internal energy, higher-temperature but less internal energy, more internal energy in higher temperature, none of these?
higher temperature but less internal energy. there is not enough energy in the the coffee to significantly change the Iceberg it is not just a question of energy but size of the material and the iceberg: that energy is dilute and each molecules moving slowly but the energy is very spread out.
if one Neutron is added to a hydrogen nucleus, the result is... Lithium, helium, hydrogen, Boron, beryllium?
hydrogen it is still a hydrogen because the protons did not change protons atomic number is unique to each element
if a TV picture tube is broken it will... Explode or implode?
implode because there is greater pressure on the outside and less pressure on the inside so the greater pressure pushes into the area of low pressure. The glass supports lots of atmospheric pressure that is why it's so thick.
assuming all the atoms exhaled by Jesus and his last dying breath are still in the atmosphere and we probably breathed one of those Atoms... Once every 10 years on average, and every breath, every day, every month?
in every breath
suppose you are standing on a weighing scale and all the sudden the atmosphere vanished. The reading on the scale would... Remain the same, decrease, increase?
increase because there would be no air which means no buoyant force equal to the weight of the air we displace. It is like being in water there is no more buoyant force so we will gain weight. this is similar to if an object is in a vacuum it will have no buoyant force because there is no Air to displace.
which of the following normally warms up fast when heat is applied... Water, wood, glass, iron?
iron because it has a low specific heat
which of these atoms has the least Mass? Gold, lead, uranium, iron?
iron. all you have to do is look at the AMU on the Periodic Chart
ice has a lower density than water because ice... Density decreases with decreasing temperature, molecules vibrate at lower rates than water molecules, molecules are more compact in the solid state, is made of open structured hexagonal crystals, sinks?
is made of open the structured hexagonal crystals. water molecules in this open structure occupy greater volume than they do in the liquid state.
buoyant force is greater on a submerged... One cubic centimeter block of aluminum, one cubic centimeter of block of lead, is the same on each?
is the same on each because they are the same size but they are displacing the same amount volume is the only Factor
the early bird communication satellite hovers over the same point on Earth's equator and indefinitely. This is because... Its orbital period is 24 hours, it pulls as hard on the earth as the earth goes on it, forces other than Earth's gravity acts on it, it is beyond the main pull of Earth's gravity, it is kept Aloft by Ground Control?
its orbital period is 24 hours it is called a geosynchronous orbit its orbital speed is always right above the Earth eqautor. to get a signal we point at the satellite it is at the equator and goes around earth once every 24 hours so it stays with us
When an iron ring is heated, the hole becomes... neither smaller, nor larger, smaller, larger?
larger because when heated things expand and even inside circle does-entire object stretches out
which has the greatest number of protons in its nucleus? silver, gold, lead, or Mercury?
lead because it's atomic number or number of protons first number on the Periodic Chart and the little box
a lobster crawls onto a bathroom scale submerged at the bottom of the ocean compared to its weight above the surface on dry ground a lobster will have an apparent weight underwater that is... The same, less, greater?
less because just like you can pick someone up and throw them in a pool it is easier to do that in water than outside of water
minimal orbital speed about the Earth is about 8 kilometers per second. Minimal orbital speed about the moon would be... About 8 kilometers per second, more than 8 kilometers per second, less than 8 kilometers per second?
less because the mass is smaller so the force of gravity is also less which means doesn't take as much speed to keep orbiting the Moon
a liter sized block of ordinary wood floats in the water. The amount of water displaced is... One liter, less than one liter, depends on the water density, none of these?
less than 1 liter because to displace 1L of the water the object must be all the way under but the whole thing is not under water
A moon's period is known as a lunar month (about 28 days). If the moon were closer to Earth than it is now the lunar month would be it... Less than 28 days, more than 28 days, no different?
less than 28 days (greater gravity closer so greater speed needed meaning take less time to orbit)
place a kilogram block of iron @40° C into a kilogram of water @ 20°C and the final tenperature of the two becomes...at or about 30°C, less than 30°C, more than 30° C?
less than 30°C because iron has a low specific heat and water has a high specific heat. the hot iron will lose temp. rapidly but the cold water temp will rise slowly
gas pressure outside an inflated stretched balloon is... Less than air pressure inside the balloon, greater than air pressure inside the balloon, equal to air pressure inside the balloon?
less than air pressure inside the balloon. there is great pressure in the balloon because as it is stretched and means it expands and has risen according to Boyle's Law the density of air is also more than the density of air outside the molecules. the molecules begin to move quickly as temperature increases the number of collisions will be doubled so this means pressure is doubled. Pressure is proportional to density
Pumice is a volcanic rock that floats in water. Its density is... Equal to the density of water, less than the density of water, more than the density of water?
less than the density of water to float a must be less dense if it's more dense and will sink.
a woman on the surface of the Earth has a mass of 50 kg and a weight of 490 Newtons. If the woman were floating freely inside a space habitat far away from the earth she would have... Less weight and more mass,Less weight & the same mass, more weight and less mass, less weight and less Mass?
less weight and the same mass because Mass never changes no matter what
a weightless astronaut in an orbiting shuttle is... Like the shuttle pulled by Earth's gravitation, beyond the pull of gravity, shielded from the Earth's gravitational field, hold only by gravitation to the shuttle which cancels the Earth's gravitational pull, none of these?
like the shuttle pulled by Earth's gravitation because you can never be beyond the pull of gravity and your shield from it never does it cancel3
in most cases which expands most with increases in temp...solids, liquids, solids and liquids usually expand at the same rate?
liquids that's why thermometers works (that's why full gasoline on hot day gas spills out of tank)
if the polar ice caps melted the resulting water would spread out over the entire Earth. The new Mass distribution would tend to make the length of day... the same, longer, shorter?
longer because angular momentum equals funny or momentum mass x velocity X Radio distance as mass spreads out and increases velocity decreases
the fact that desert sand is very hot in the day and very cold at night is evidence that Sand has a... High specific heat or low specific heat?
low specific heat because it doesn't resist changes in temperature. high specific heat can be thought of as thermal inertia.
a substance that heats up relatively quickly has a... Low specific heat or high specific heat?
low specific heat because it rapidly changes think of the sand at the beach versus the water which takes a long time to heat up yet storage Great internal energy and keeps it for a long time.
suppose you put very large diameter tires on your car. Then your speedometer will show speed that is... Higher than it actually is, lower than it actually is?
lower than it actually is because you're covering more distance in the same amount of time
the baseball bat is balanced on the fulcrum. The center of gravity of the bat is located at... The tip of the bat, the middle of the bat, the neck of the bat?
middle of the bat
if we could create a 1 cm diameter lump of protons with no space between them, the lump would weigh how much? Less than 1 gram, millions of tons, as much as a small car, 5 kg?
millions of tons. if you got a lump of pure protons one cubic centimeter on Earth would weigh about 133 million tons though ball of atoms is mostly empty space there's a lot of mass protons are very heavy.
the reason the moon does not crash into the earth's surface is that... Gravitational pull of other planets keeps them up, moon has sufficient tangential speed, Earth's gravitational field is weak at the moon, moon has less mass than the earth, none of these?
moon has sufficient tangential speed so it keeps missing the Earth it wants to fall but speed won't let it so keeps missing Earth's curve
stand a meter stick on its end and let go and it rotates to the floor. If you attach a heavyweight to its upper end and repeat falling time will be... More slower, the same, less meaning faster
more meaning slower because distributing Mass is being spread out to the end so resist changes and inertia meaning it's going to fall slower (think of ice skater w/ one arm out rather than both in)
a positive ion has... More protons than electrons, more neutrons than protons, more protons than neutrons, more electrons than protons, more neutrons than electrons?
more protons than electrons (ion:a charged particle due to loss or gain of electrons) protons charge is equal to electrons
alcohol is less dense than water. If alcohol is used to make a barometer on a day when atmospheric pressure is normal the height of the alcohol column would be... 10.3 M about 34 ft, more than 10.3 M about 34 ft, less than 10.3 M about 34 ft?
more than 10.3 M about 34 ft. Alcohol is less dance. because the liquid is lighter the atmosphere can hold more of it up.
minimum orbital speed about Jupiter would be... More than 8 kilometers per second, about 8 kilometers per second, less than 8 km per second?
more than 8 kilometers per second because Jupiter has more mass so greater gravitational force some more speed and needs to stay in orbit
horses that move with the slowest tangential or linear speed on a Merry-Go-Round are located near the center, near the outside, anywhere because they all move at the same speed?
near the center
a flywheel has a greater rotational inertia when most of its mass is... Near the axis farthest from the rim, nearest the rim farthest from the axis, uniformly spread out as in a disc?
nearest the rim because rotational inertia depends on the distribution of its mass. greater distance between the bulk of an object's mass and its axis of rotation means the greater rotational inertia or resistance. (think weight)
if two protons are added to an oxygen nucleus the result is... Oxygen, nitrogen, neon, helium, none of these?
neon because oxygen has 8 protons you're changing element and adding to so it becomes neon with atomic number of 10
the best time for digging clams when the low tide is extra low is during the time of... quarter moon, Half Moon, New or full moon, none of these in particular?
new or full moon because during spring tides low tides are lower than average and occurs at new or full moon
a common 5-liter metal can will float in air if it is... Filled with a large amount of helium, thrown high enough into the air, evacuated of air, nonsense unless the displaced are weighs at least as much as I can and its contents the can will not float in air?
nonsense unless the displaced Airways at least as much as the can and its contents they can will not float in Air
what distinguishes one element from another? The number of electrons, the number of neutrons, the number of protons, the total mass of all the particles?
number of protons. Think about the very top number in the periodic chart that is unique to each element if you change the proton you get anoher element Pronton=ID
solid matter is mostly empty space. The reason solids don't fall through one another is because... Atoms are constantly vibrating even at Absolute Zero, of nuclear forces, of gravitational forces, of electrical forces?
of electrical forces. for example tabletop is so solid but made of mostly empty space because electrons repel each other with 10 to the 40th times stronger than gravity the electron shell of one atom and another atom will not come into contact.$
if a gram of antimatter meets two grams of matter the amount of mass to survive is... One gram, 999, two, three grams?
one gram because they and I like each other in equal amounts. 1 gram of antimatter equals 1 gram of matter gone. Into Pure Energy
what do all the elements in the last column of the periodic table have in common? Helium neon argon Etc. Outermost electron shell is full, same number of electron shells, same number of electrons in their outermost shell, more than eight electrons in their outermost shell?
outermost electron shell is full they do not want to interact with any other elements because they don't need any more electrons. They are the least reactive Row in the chart.
if a strong wind from the West breaks a window in the north wall of the house, most of the glass will fall... Upward, outside the house, inside the house?
outside the house because according to Bernoulli's principle The Wind over the house creates an area of low pressure there for the high pressure in the house will press towards the area of low pressure.
the force of gravity acts on all apples on an apple tree. Some apples are twice as far from the ground as others. These twice as high apples, for the same mass have... Practically the same weight, half the weight, 1/4 weight?
practically the same weight (doesn't make difference in height of apples=negligible just tree)*
tangential speed and rotational speed are
proportional
the weight of matter comes mostly from its... Protons, electrons, neutrons, protons and electrons, protons and neutrons?
protons and neutrons because most of the mass that makes up an atom is in the nucleus protons and neutrons are in the nucleus electrons are like nothing they had no weight
which of the following statements is true... They're only about 12 different kinds of atoms that combine to form all substances, protons and neutrons have equal mass, an atom is the smallest particle known to exist, there are thousands of different kinds of atoms that count for a wide variety of substances?
protons and neutrons have equal Mass
a suction cup stick to a wall. It is... Pushed to the wall by the atmosphere, held to the wall by the vacuum, both these, neither of these?
pushed to the wall by the atmosphere because atmospheric pressure the atmosphere has weight. Vacuums do not suck or pull it is all about atmospheric pressure.
Brownian motion has to do with the... Rhythmic movements of Brownian, random motions of atoms and molecules, the size of atoms, Atomic vibrations?
random motions of atoms and molecules$
in our part of the universe antimatter is... Nonexistent, rare, plentiful?
rare
roll a bowling ball off the edge of a table. As it's Falls it's horizontal component of velocity... Remains constant, decreases, increases?
remains constant. The horizontal component of velocity never changes only the vertical because of gravity
a car with closed windows makes a right hand turn. A helium filled balloon in the car will move to the... Front, left, back, right?
right because it acts like an accelerometer it leans towards the direction of acceleration like the green Blobby thing in the bottle of water. dancer errors on the bottom it rises towards less dense you and your car go to write the air wants to go straight the balloon goes into area of low pressure.
a huge rotating cloud of particles in space gravitate together to form an increasingly dense ball. As it shrinks in size the cloud... Rotates slower, rotate at the same speed, rotates faster?
rotates faster because angular momentum equals linear momentum mass x velocity X radial distance so as it's tree creases in Mass it will increase in velocity
centrifugal forces are an apparent reality to observers in a reference frame that is... Rotating, an inertial reference frame, moving at constant velocity, at rest?
rotating because the down direction will be what observers call radially outward away from the center even though ventrifugal force is fake it's realy centripetal (centerseeking)
a torque acting on an object tends to produce... Equilibrium, a center of gravity, rotation, linear motion?
rotation because to make a stationary object move you apply Force. If you want to rotate you apply torque which is lever arm( shortest distance between applied for us and rotational axis) X Force
the pressure at the bottom of the jug filled with water does not depend on... acceleration due to gravity, water density, shape of The Jug, the height of the liquid?
shape of The Jug because they celeration due to gravity contributes to weight, water density is in the equation for pressure, the height of the liquid determines the depth and pressure increases with depth
to multiply an input force, the input endshould be the one having the... smallerr-diameter piston, larger-diameter piston, relative piston Size Doesn't Matter?
smaller diameter piston because you you cannot supply enough force on the larger piston to get it to move
ice tends to form at the... Surface of bodies of water, bottoms of bodies of water?
surface of bodies of water. Just think of lakes.
which of the following is a mixture... Carbon dioxide, water, tea, oxygen?
tea because it is not chemically combined with two or more substances
the reason a life jacket helps you float is... The jacket makes you weigh less, the jacket repels water, if you sink the jacket sinks, the jacket has the same density as an average human, the density of both you and the jacket together is less than your density alone?
the density of both you and the jacket together is less than your density alone. Weight density equals weight divided by volume if your volume increases your weight density decreases so you can float
an egg is placed at the bottom of a bowl filled with water. Salt is slowly added to the water until the egg Rises and floats. From this experiment one concludes... Salt sinks to the bottom, buoyant force does not always act upward, the density of saltwater exceeds the density of egg, calcium in the egg shell is repelled by sodium chloride, none of these?
the density of saltwater exceeds the density of egg. The water has such great buoyancy that it causes the egg to float pushing up on it
a hydraulic press multiplies a force by 100. This multiplication is done at the expense of... The time through which the force acts which is x 100, the distance through which the force acts, the mechanism providing the force, energy which is divided by 100?
the distance through which the force acts you always trade off for force and distance you push down on the left it goes really far to get the right to go up a little
there is a legend of a Dutch boy who bravely held back the Atlantic Ocean by plugging a leak near the top of the dike with his finger until help arrived which of the following is most likely? Both the force and the pressure on his finger would have been great but not too great for a public-spirited Dutch lad, the huge size of the Atlantic Ocean makes this impossible, although the force on his finger would have been huge the pressure would have been small enough for this to occur, the force on his finger would have been small enough to make this possible, none of these?
the force on his finger would have been small enough to make this possible pressure only functions with depth not with or size of the body of water the whole was not down far from the surface of the water pressure was low
compared to the atoms that make up the body of an elderly person, the atoms that make up the body of a newborn baby are... Newer, actually older, the same age?
the same age*
after a rock that is thrown straight up reaches the top of its path and is starting to fall back down it's acceleration is (neglect air friction)... greater then when it was at the top of its path, the same as it was at the top of its path, less than when it was at the top of its path?
the same as it was at the top of its path (gravity (force) always causing acceleration (g never turns off so accel is constant)-never stops vertical component is 0 not accel) *
compared to the energy it takes to separate oxygen and hydrogen from water the amount of energy given off when they recombine is... More, less, the same?
the same because conservation of energy
if the sun collapse to a black hole the Earth's gravitational attraction to it would be... Less, same, more?
the same because nothing changed the gravity force is still the same the mass is still the same the distance is the same ( think of the force equation remember it is mass not size and distance from the center so does not matter the size)
consider two Mercury barometers, one with twice the cross-sectional area of the other. Neglecting capillarity, mercury in the smaller tube will rise... The same height as it does in the larger tube, twice the height as mercury in the larger tube, four times as height as mercury in the larger tube, more than four times as high as in the larger tube, none of these?
the same height as in the larger tube diameter is irrelevant whether the tuba skinny or wide it will still rise to 30 in because if there's more area the atmosphere pushes on with the same force on a greater area creating more pressure. Width does not matter only variables that matter ARE: density of liquid and atmospheric pressure.
compared to the buoyant force of the atmosphere on a 1 L of helium filled balloon the buoyant force of the atmosphere on a nearby one liter solid iron block is... Considerably more, the same, considering last?
the same. buoyant force is equal to the weight of the volume of fluid displaced both objects are 1 LITER so they are displacing the same volume and weight of air.
a helium filled balloon released in the atmosphere will rise until... The balloon and surrounding air have equal densities, atmospheric pressure on the bottom of the balloon equals atmospheric pressure on the top of the balloon, the weight of the displaced air equals the buoyant force?
the weight of the displaced air equals the buoyant force according to the principle of floatation a floating object displaces a weight of fluid equal to its own weight allowing it to hover. Choice to is impossible because pressure increases with depth.*
there are about as many atoms of air in our lungs at any moment as there are breaths of air in the atmosphere of... The whole world, the United States, a large Auditorium, a large city?
the whole world
the speed of the planets about the sun depend on... And masses of the planets, their distances from the Sun, both of these, neither of these?
their distances from the Sun because closer planet is the Sun the greater the gravity therefore the speed must be greater to orbit the star and it's closer to the sun lose PE so gain kinetic energy$
if you stake out a plot of land with a steel tape on a very hot day, the amount of land you have will be...correct, too large, too small?
too large because it is hot the tape will expand thus it will seem you have more land
suspend a pair of ping pong balls from two strings so there is small space between them. If you blow air between the walls they will swing... Apart from each other, towards each other, away from the Airstream, but not necessarily toward or apart from each other?
toward each other because according to Bernoulli's principle be blowing means the speed of the fluid increases in the internal pressure in the fluid decreases creating an area of low pressure so the high pressure against the balls will cause them to come towards each other like fast cars driving on the highway passing each other at tend to sway towards each other.
consider a closed sealed can of air placed on a hot stove. The contained air undergoes an increase in... Temperature, Mass, pressure, all of these, two of these?
two of these being temperature and pressure as temperature increases the molecules move faster and creates more pressure
the reason that buoyant force act upward on a submerged object is that... If it acted downward nothing would float, upward pressure against the bottom is greater than downward pressure against the top of the submerged object, it acts in a direction to oppose Gravity, the weight of fluid displaced reacts with an upward Force?
upward pressure against the bottom is greater than downward pressure against the top of the submerged object because pressure increases with depth
a completely submerged object always displaces its own... Density of fluid, volume of fluid, weight of fluid, all of these, none of these?
volume of fluid. a completely submerged object always displaces a volume of liquid equal to its own volume.$*
which of these will contract when warmed a little... water @0°C, water @ 4°C, water @-4°C, water @ 6°C?
water @ 0°C becauee from 0 to 4° when warmed does opp of expected and contracts BUT ONLY IN THIS RANGE
which of the following is a compound... Apple pie, hydrogen, air, water?
water H2O is a compound it is chemically combined with something
which of the following expands most when temperature is lowered? Equal volumes of... Helium, water at 4 degrees Celsius, iron, wood, none expands when the temperature is lowered?
water at 4 degrees Celsius. water from 4 degrees C to 0 degrees C as temperature is lowered instead of Contracting ice expands.
during a very cold winter water pipes sometimes burst the reason for this is... Water contracts when freezing, the ground contracts when colder pulling pipes apart, the following process releases pressure on the pipes, water expands when freezing, none of these?
water expands when freezing just think of putting something in the freezer and it explodes
a dam is thicker @ the bottom than @ the top because... Surface tension exist only on the surface of liquids, water pressure is greater with increasing depth, it looks better, water is denser at deeper levels?
water pressure is greater with increasing depth and at the bottom if there's greater pressure and needs to be sicker so it can Hold Back the Water
a balloon is buoyed up with a force equal to the... Density of surrounding air, weight of a balloon and contents, weight of air it displaces, atmospheric pressure?
weight of air it displaces according to the Archimedes principle of air an object and air is boot up with a force equal to the weight displaced are just like in liquids
atmospheric pressure is caused by? the weight of the atmosphere density of the atmosphere temperature of the atmosphere the effect of the sun's energy on the atmosphere?
weight of the atmosphere because atmospheric pressure is the pressure exerted against bodies immersed in the atmosphere resulted from the weight of air pressing down from above
if the mass of the Earth somehow increased with no change in radius your weight would... Stay the same, increase also, decrease?
weight would increase also
to turn a stubborn screw it is best to use a screwdriver that... long handle or wide handle?
wide handle (all about how THICK it is not long-long is for prying a lid of paint can open but fat handle applies large force to lever arm)
if the radius of the Earth somehow decreased with no change in mass your weight would... Decreased 1/4 your original wait, stay the same, decreased half your original weight, none of these?
( use Force equation) increase because if there's less distance there's greater force they are inversely proportional (distance less betwn U & earth so greater force on you-force being weight)
consider two planets in space that gravitationally attract each other. If the masses of both planets are doubled then the force between them is... One quarter, half as much, twice as much, four times as much, none of these?
( use equation again) four times as much because as you increase both masses two times you have four times the mass which is proportional to force the four times the mass is equal to 4 times the force
a woman who normally weighs 400 newtons stands on top of a very tall ladder so she is one Earth radius above the Earth's surface. How much would she weigh there?... 0, 100 Newton's, 200 Newtons, 400 newtons, none of these?
(so 2x radius) 100 Newton's because one Earth radius means two times the radius using the inverse Square law we need 1/4 the intensity 1/4 of 400 is 100
halfway to the center of a completely Hollow Planet composed of uniform shell your weight compared to the outer surface would be... 1/4, 1/2, 3/4, the same as at the surface, 0?
0 because once you're in a hollow Planet gravitational force cancels and the net force is zero
a bullet fired horizontally over level ground hits the ground in 0.5 seconds. If it had been fired with twice the speed in the same direction it would have hit the ground in... more than 0.5 seconds, 0.5 seconds, less than 0.5 seconds?
0.5 seconds because doesn't matter the speed will hit the ground in the same time no matter what
on a balanced seesaw, a boy three times as heavy as his partner sits... Less than 1/3 the distance from the fulcrum as his partner,1/3 the distance from the fulcrum as his partner, more than 1/3 the distance from the fulcrum as his partner?
1/3 the distance from the fulcrum as his partner because the torques (lever arm distance x force) must be equal (Boy is 300 lbs x 1 distance- 100lbs x 3 distance --> 300=300)
a gun with a muzzle velocity of 100 meters per second is fired horizontally from a tower neglecting air resistance where will the bullet be one second later?...
100 m down rage (He gives it to you in QUESTION! 100m/s so 1 sec 100 m)
an object is dropped and freely falls to the ground with an acceleration of 1 g. IF it is thrown Upward at an angle instead it's vertical acceleration will be... zero g, 1 G downward, 1 G upward, larger than 1 G, none of these?
1G downward because whether dropped or thrown up the acceleration is same acceleration due to gravity is always acting downward NO MATTER WHAT
asteroid exerts a 360 Newton gravitational force on a nearby spacecraft. If the spacecraft moves to a point three times as far from the center of the asteroid the force will be... 1080 Newton's, 40 Newtons 120 Newton's, 360 Newtons, zero?
40 Newtons ( hint you use the inverse Square law if it's three times that's for then it's 1 / 9 and we know the intensity is given which is 360 so 360 / 9 equals 40)
a stone is thrown horizontally from the top of a cliff. One second later it has left your hand it's vertical distance below the top of the cliff is... 5 meters, 10, 15 meters?
5 (distance= 1/2 g t squared gravity. Half of 10 is 5 & 5 * 1 is 5 so 5m)
a projectile is launched at ground level and an of 40 degrees above the horizontal and lands down range. What other projection angle of the same speed would produce the same downrange resistance?... 30 degrees, 45 degrees, 50 degrees, 75 degrees, 90 degrees
50 degrees because 40 + 50 equals 90. the same range is obtained from two different launching angles when the angles add up to 90 degrees or are complementary
a projectile is launched vertically Upward at 50 meters per second. If there is no air resistance its speed Upon returning to its starting point is... More than 50 meters per second, less than 50 meters per second, 50 meters per second?
50 m per second (because it is a mirror image of the trip up and down it goes from 50 up to 40 up to 30 up to 20 up to 10 up to zero and down the same way from 10 to 20 to 30 to 40 to 50)
two projectiles are fired from the ground level at equal speeds but different angles. One is fired at an angle of 30 degrees and the other at 60°. The projectile to hit the ground last will be the one fired at neglecting air friction... 30 degrees, 60 degrees, both hit at the same time?
60 degrees. the angles are complementary meaning they travel the same distance yet 60 has a longer path to go it is higher.
a bullet is fired horizontally with an initial velocity of 300 meters per second from a tower 20 M high. If air resistance is negligible, the horizontal distance the bullet travels before hitting the ground is about... 300 M, 400 m, 600, 500, 200m?
600m (20 m tells you 2 sec so 300m/s 2 secs means 600m/ plug into 20 for d 20=1/2gtsqaured & you get 2 secs)
toss a baseball into the air and it wobbles about its... Point of last contact with your hand, have your end, center-mass, lighter end?
Center of mass. The average position of all the mass that makes up an object. The baseball follows a smooth parabolic trajectory because of its geometrical Center unlike a baseball bat the bat wobbles around its CG/CM)
the chef at the infamous fattening Tower Pizza tosses a Spinning Disk of uncooked pizza dough in the air. The discs diameter increases during a flight while its rotational speed... Increases, remains constant, decreases?
DECREASES. Rotational speed (RPM) is now going to be slower because takes more time to get greater distance around in circle. (think merry go round diamter increase)
the planet Jupiter is about 300 times as massive as Earth, yet on its surface you would weigh only about three times as much. This is because... Jupiter's radius is 10 times the Earth's radius, you are a hundred times more weightless there, your mass is a hundred times Less on Jupiter, Jupiter is significantly farther from the Sun, none of these?
Jupiter's radius is 10 times the Earth's radius. remember it is distance from the centers of each planet. as distance increases from the center the force is less . on Earth you are closer to the center so gravity force is stronger.
a ball player wishes to determine pitching speed by throwing a ball horizontally from an elevation of 5 m above the ground. The player sees the ball land 25 M down range. What is the Player's pitching speed... About 5 m/s, about 10 meters per second, about 20 meters per second, about 25 meters per second, none of these?
about 25 m/s (5 m only occurs in 1 sec so 1 sec and 25 m so 25m/s)
throw an object at an angle upward. with no gravity it will follow straight line path because of gravity at the end of one second it is... About five meters below the straight-line, about 10 meters below the straight line, about 15 meters below the straight line?
about five meters below the straight-line because D equals 1/2 g t squared
Tower of Pisa doesn't topple over because it's center of gravity is... Above its base, displaced from its Center, relatively low for such a tall building, in the same place as its Center of mass, stabilized by its structure?
above its base is the only requirement to keep from toppling
without air resistance a projectile fired horizontally at 8 km per second from a top of mountain will... Trace a curve that matches the Earth's curvature, accelerate downward at G as it moves horizontally, return later to its starting position and repeat its falling behavior, all of these, none of these?
all of these because a projectile fired from 8 km per second reach is no atmosphere just like a space shuttle and we'll keep on going and falling
the amount of gravitational force that acts on the space shuttle while in orbit is... Almost as much as the shuttles wait on the Earth's surface, nearly zero, the same as the shuttles wait on the Earth's surface?
almost as much as the shuttles waiting on the Earth's surface (farther distance so less force(force of gravity equation & think magnets) the satelllite is barely off the surface so such a small difference (but it's there). (gravity is still acting pulling on it so it does not go in a straight line)
for the astronauts inside the orbiting space shuttle, there is no force of gravity acting on them. This statement is... Sometimes true while in orbit, always true while in orbit, always false?
always falls because gravity Acts no matter what. passengers don't have enough tangential speed to be in free fall while those Opening space the space station is in free-fall so they feel weightless.
A ball rolls down a hill mainly because of... And unbalanced torque, angular momentum, and unbalanced force, its rotational inertia?
an unbalanced troque because torque is lever arm X Force. Torques cancel like ordinary forces and requires an unbalanced torque to get something to rotate note force has to be perpendicular to the lever arm
inside a freely falling runaway elevator your... Gravitational interaction with the Earth is 0, acceleration is zero, apparent weight is 0, all of these, none of these?
apparent weight is 0 because you lack of support force but gravity is still acting no matter what
when doing somersaults you'll more easily rotate when your body is... Balled up, straight, no difference?
balled up because when you pull the way inward the rotation will inertia of the body and the weight is reduced so his speed increases. the principle of conservation of angular momentum decreasing rotational inertia I and rotational speed w correspondingly increase (that's why you choke up when batting!)
an airplane flies at 40 minutes per second at an altitude of 50 meters. The pilot drops a heavy package which falls to the ground. Where approximately does the package land relative to the plane's new position?...beneath the plane, 500, behind the plane, 400 m behind the plane, more than 500 m behind the plane?
beneath the plane (b/c horisontal speed of plane and package are SAME & CONSTANT approx (little friction drag behind) but otherwise beneath)
the Earth's gravitational field extends... Any place in the universe where is not blocked by Massive object, only above and beyond the Earth's surface and cancels inside the earth, both inside and outside Earth and throughout the entire universe?
both inside and outside the Earth and throughout the entire universe (gravity only cancels (netforce=0) IN A HOLLOW PLANET & EARTH IS NOT A HOLLOW PLANET)
the long, heavy tail of a spider monkey enables the monkey to easily vary it's... Weight, center of gravity, inertia, momentum, none of these?
center of gravity
the force of gravity does no work on a satellite when it is in... Elliptical orbit, circular orbit, both of these?
circular orbit because in order to do work a force must be parallel to the direction of motion but in a circular orbit the force is perpendicular@
a coin and a ring roll down an incline starting at the same time. The one to reach the bottom first will be the... Ring, coin, OR both reach the bottom at the same time?
coin because a ring has more rotational inertia so it's harder to start rolling because most of its mass is far from its axis of rotation
if the Earth rotated faster about its axis your apparent weight would... Decrease, increase, stay the same?
decrease
if the Earth's mass decreased to 1/2 its original Mass with no change in radius then your weight would... Decreased 1/4 your original waeight, stay the same, decrease to one half your original weight, none of these?
decrease to 1/2 your original weight ( plug into Force equation) because force and mass are proportional a decrease in half the mass equals a decrease in half the force meaning weight
as as the rock thrown Upward at 50° with respect to the vertical it's vertical component of velocity ignoring air friction is... Remains unchanged, decreases, increases?
decreases (key words: AS IT RISES, we know it has to decrease because at top of projectile's path is 0 doesn't exist only horizontal THEN it increases)
consider a rotating donut-shaped space habitat where living quarters are on the inside surface farther from the axis. If the rotational speed of the habitat decreases the apparent weight of people inside... Stays the same, increases, decreases?
decreases b/c your in space w/simulated gravity then your fake earth gravity is taken (slows) away you r going to weigh less because YOU R IN SPACE!!!
if a record player rotational speed is doubled then the linear speed of a pet hamster sitting on the edge of the record will... halve, double, remain the same?
double because rotational speed or RPMs is proportional to linear or tangential speed so two times the RPMs is equal to 2 times the tangential speed
according to Kepler's laws, the paths of planets about the Sun are... Ellipsis, circles, parabolas, straight lines, none of these?
ellipses (Kepler's laws:each planet moves in elliptical orbit w/ sun as focus, #2: the line from the sun to any planet sweeps out equal areas of space in equal time intervals, #3)moves slower against gravitational field & faster w/)@
during an eclipse of the Sun the high ocean tides on Earth are... Not particularly different, extra high, extra low?
extra high because these are spring tides water Springs up higher than average high tides and lower than average low tides
an Earth satellite is in an elliptical orbit. The satellite travels slowest when it is... nearest Earth, farthest from the earth, it travels at constant speed everywhere in orbit?
farthest from the Earth because an elliptical orbit its speed and distance vary PE is greatest when the satellite is farthest away so kinetic energy is less (apogee) and when pretty close (pedigree) less PE some more ke yet at every point in the orbit the sum of the KE and PE is the same ( a circular orbit the PE of the satellite is the same everywhere in orbit so the KE is also constant because the PE is)
how far must one travel to get away from the Earth's gravitational field... To a region above the Earth's atmosphere, to a region beyond the solar system, to a region well beyond the moon, forget it you can't travel far enough?
forget it you can't travel far enough
according to Newton the greater the mass of interacting objects the... greater the gravitational force between them, less gravitational force between them, greater the force between them by the square of their masses?
greater the gravitational force between them because Force=G× m1m2/d2 so as mass increases the greater the force
Tides rise and fall... Greatly different distances in different places, the same distance in all parts of the world?
greatly different distances in different places
your pet hamster sits on a record player whose angular speed is constant. If he moves to point half as far from the center then his linear or tangential speed is... Remains the Same, halves, doubles?
halves because hamster was sitting on the edge but now he goes a little towards the center where speed is 0 so speed is decreasing. tangential speed depends on distance from the axis is also proportional to angular speed of rotational speed so half the tangential speed equals half the RPM
when the distance between two stars decreased by half the force between them... Increases to twice as much, increases to 4 times as much, decreases by 1/2, decreases by 1 quarter, stays the same?
increases to four times as much because the inverse Square law says 1/2 flip it and equals 2 and 2 squared equals 4 meaning four times as much force
two objects move toward each other because of gravity as objects with closer and closer the force between them... decreases, increases, remains constant?
increases. think of magnets when we get closer to each other they attract more and come together the force gets stronger
the main reason ocean tides exist is that the pull of the moon... Is greater on Oceans closer to the moon and less on Ocean's farther from the Moon, and the Sun on the oceans are in opposite directions, and Sun are in conjunction at high tides in an opposite of low tides, is greater on the earth because the moon is closer to the Earth?
is greater on Oceans closer to the moon and less on Ocean's farther from the Moon. the root cause of Tides is the difference of a force of the Moon from one side to the other side of the earth causing things to be stretched.
suppose you're at the center of a largely freely rotating horizontal turntable @ a Carnival Fun House. As you crawl toward the edge, the angular momentum of you and the turntable... Remains the Same but the RPMs dencrease, decrease in direct proportion to your decrease in RPMs, decreases, none of these?
remains the same but RPMs decrease. BECAUSE angular momentum is always conserved & you in middle go faster but toward edge slow down
a rock is thrown Upward at 50° with respect to the horizontal. As it rises ignoring air friction its horizontal component of velocity... decreases, increases, remains unchanged?
remains unchanged because gravity acts only downward so trajectory of a projectile that accelerates only the vertical Direction while moving at a constant velocity is a parabola (horizontal component is constant!)
a black hole is... Simply the remains of a giant star that has undergone gravitational collapse, a small region that contains the mass of many galaxies, and empty region of space with a huge gravitational field?
simply the remains of a giant star that has undergone gravitational collapse
acceleration due to gravity on the moon is less than Earth, the Moon is smaller than the earth so compared to an Earth satellite a satellite in close orbit around the Moon would travel... Slower, faster, the same, not enough information is given to say?
slower***
tangential speed
speed of something moving along a circular path depends on distance from the axis. if you move out two times as far as your speed doubles. rotational speed RPM is proportional to tangential speed. there is no speed at the center-you r just merely rotating.
if you drop a stone into a hole drilled all the way to the other side of the Earth neglecting the molten core the stone will... Slow down until it reaches the center, come to abrupt halt at the center of the earth, speed up until it gets to the Center of the Earth, speed up until it reaches the other side of the Earth?
speed up until it gets to the Center of the Earth ( if you go into the tunnel there's no longer inverse-square relationship it becomes the linear so if you're halfway in the tunnel you lose half of your weight so half the force once you're all the way inside at the center you have zero Force--> accel is less and less toward center that's how it gets to 0)
a person weighs less at the equator than at the poles. The main reason for this has to do with the ... influence of the sun moon and all the planets, law of action and reaction, tidal bulges, spin of the earth, high temperature at the equator and expansion of matter?
spin of the Earth (because tangential speed is greater (moving faster=less weight) at edge but at pole (at axis) speed is 0 so greater weight)
a hunter on level ground fires a bullet at an angle of 10 degrees above the horizontal while simultaneously dropping another bullet from the level of the rightful which bullet will hit the ground first?... The dropped one, both at the same time, the fired one?
the dropped one (10° & 0° @ 10° has longer trip takes more time to hit ground YET they accel @ same rate) (0° already down so has advantage)
neglecting air resistance which will roll from rest to the bottom of an incline first an empty jar or the same jar filled with peanut butter? the filled jar, the empty jar, Or both will reach the bottom at the same time?
the filled jar because has less rotational inertia its mass is towards the center rather than spread out
which produces a greater tidal effect on your body? the moon or a 1kg melon held above your head... The melon, the moon, not enough information is given to make reasonable estimate?
the melon because the distance is closer meaning the force is greater (right now pulling on you from head to feet)
the fastest moving planet in any solar system must be... Any planet for they all move at the same speed, the planet farthest from the Sun, the most massive planets, the smallest planet, the planet nearest the Sun?
the planet nearest the sun (stronger gravity near the sunso more speed you need to stay in orbit arounf the star-greater the gravity the greater the speed you need)^
suppose a certain Carnival has a ferris wheel where the seats are located halfway between the center and outside of Rim. Compared to an ordinary Ferris wheel where the seats are on the outside Rim your angular speed while riding this Ferris wheel would be... -The same and you're at and tangential speed would also be the same -the same and your tangential speed less -less and your tangential speed more, -more and your tangential speed would also be more, -more and your tangential speed less?
the same & your tangential speed less because tangential speed is linear speed along a curved path the farther in you are the slower the speed and angular speed is number of rotations per unit of time so it is the same (b/c no icrease in diamter)
planets could crash into the sun if it weren't for... Their vast distances from the Sun, the fact they are beyond the main gravitation of the sun, their tangential velocities, the inverse Square law, their relatively small masses?
they're tangential velocities they fall around the earth rather than crash into it because their speed is great enough to ensure the following distance matches the Earth's curved. the Earth drops 5 for every 8000 tangent to the surface.
an asteroid exerts a 360 Newton gravitational force on a nearby spacecraft. The force is directed... Away from the asteroid, toward the sun, toward the asteroid?
toward the asteroid (think: where is spacecraft going to go if being pulled by gravitational force by asteroid? toward asteroid/the force)
an Earth satellite is simply a projectile freely falling around the earth... True or false?
true (keeps missing the earth because of great tangential velocity)
if you put a pipe over the end of a wrench when trying to turn a stubborn nut on a bolt, effectively making a wrench handle twice as long, you will multiply the torque by... 2, 4, 8?
two because you increase the torque by increasing the lever arm and or Force (torque=lever arm distance x force CAUSES ROTATION)
passengers in a high-flying jumbo jet feel their normal weight in flight & passengers in the orbiting space shuttle do not. this is because passengers in the space shuttle are... Beyond the main pull of Earth's gravity, above the Earth's atmosphere, and without support forces?
without support forces because gravity is everywhere and that atmosphere even an interplanetary space.
