physics test 3 (ch9-13)
both forces are the same
A very massive object A and a less massive object B move toward each other under the influence of gravitation. Which force, if either, is greater? the force on A the force on B Both forces are the same.
collapsed stars
Black holes are essentially _______. not confirmed as existing collapsed stars very dark stars the vacuum cleaners of space
2
How many protons should be added to the nuclei of oxygen atoms so the resulting gas will glow red when there is an electric current through it? 3 1 2 4 But protons will have to be subtracted, not added.
no
If no molecules in a body could escape, would the body have any odor? yes no
yes
Is gravitational force acting on a person who falls off a cliff? yes no
electrons
The chemical properties of matter come mostly from its electrons. neutrons. protons.
gains
To become a negative ion, does an atom lose or gain an electron? loses gains
loses
To become a positive ion, does an atom lose or gain an electron? gains loses
9
How many atoms are in a molecule of ethanol, C2H6O?
ancient stars
Nuclei of atoms that make up a newborn baby were made in the Earth. ancient stars. the food the mother eats before giving birth. the mother's womb. none of these
A
ow do the high tides during a full moon compare to high tides during a new moon? A The high tides during a full moon are roughly the same as the high tides during a new moon. B The high tides during a full moon are not as high as the high tides during a new moon. C The high tides during a full moon are higher than the high tides during a new moon.
B
rocket that falls toward the event horizon, you would notice your own clock to be running __________. A increasingly faster as you approach the event horizon B at a constant, normal rate as you approach the event horizon C increasingly slower as you approach the event horizon
uranium
which of these atoms has the greatest amount of electrical charge in its nucleus? helium gold carbon iron uranium
thermonuclear fusion
Atoms heavier than helium were made by thermonuclear fusion. photosynthesis. radiant energy conversion. radioactivity. none of these
D
How far must one travel to get away from the Earth's gravitational field? A to a region well beyond the moon B to a region beyond the solar system C to a region above the Earth's atmosphere D Forget it; you can't travel far enough.
the whole world
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 United States. a large auditorium. a large city. the whole world. none of these
increases
Two objects move toward each other because of gravity. As the objects get closer and closer, the force between them increases. decreases, then increases. decreases. remains constant. increases, then decreases.
specks of dust moving around
What did Robert Brown see under the microscope? atoms moving around atoms mixed with specks of dust moving around specks of dust moving around
lead
Which has the greatest number of protons in its nucleus? mercury. gold. lead. silver.
neutron
Which of the following are electrically neutral? ion electron proton neutron none of these
electrons
Which of the following are negatively charged? Electrons Neutrons Atomic nuclei Protons
A
A black hole is A simply the remains of a giant star that has undergone gravitational collapse. B a small region that contains the mass of many galaxies. C an empty region of space with a huge gravitational field.
electrical force
A force that determines the chemical properties of an atom is a(n) gravitational force. friction force. nuclear force. electrical force. none of these
A
As the falling rocket plunges toward the event horizon, an observer in the orbiting rocket would see that the falling rocket __________. A slows down as it approaches the event horizon, and never actually crosses the event horizon B slows down near the event horizon so that it crosses the event horizon at a low speed C moves at constant speed as it approaches and crosses the event horizon D accelerates as it falls, and crosses the event horizon at high speed
ageless
As the text cites, atoms are incredibly tiny, numerous, perpetually moving, and what else? Mainly in the air Ageless Migratory New in science
orbital electrons
In an electrically neutral atom, the number of protons in the nucleus is balanced by an equal number of neutrons. orbital electrons. quarks. all of these none of these
A
The Earth's gravitational field extends A both inside and outside the Earth and throughout the entire universe. B only above and beyond the Earth's surface and cancels inside the Earth. C neither of these
practically the same weight
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. 1/4 the weight. 1/2 the weight.
a
The main reason ocean tides exist is that the pull of the moon A is greater on oceans closer to the moon and less on oceans farther from the moon. B and the sun on the oceans are in opposite directions. C is greater on the Earth because the moon is closer to Earth. D and sun are in conjunction at high tides and in opposition at low tides. E none of these
three
The number of atoms in a common water molecule is _______. three four two one
the force decreases to one quarter
What happens to the force of attraction between two planets when the distance between them is doubled? The force decreases to half. The force doubles. The force remains the same. The force decreases to one quarter.
500 N
What is the force of gravity on a 500-newton woman standing on the Earth's surface? 250 N 500 N 5000 N 50 N none of these
18 amu
What is the molecular mass of a water molecule? 18 amu 10 amu 12 amu 15 amu None of these. It depends on the temperature.
the number of protons
What makes an element distinct? the number of electrons the total mass of all the particles the number of neutrons the number of protons none of these
D
Which of these statements is true? A Molecules form atoms that in turn determine chemical properties of a substance. B Chemical elements are made up of about 100 distinct molecules. C A molecule is the smallest particle that exists. D Molecules are the smallest subdivision of matter that still retains chemical properties of a substance. E None of these statements is true.
the sun
Which pulls on the oceans of the Earth with the greater force? the sun the moon Both pull the same.
A
Why do the astronauts in the Space Shuttle float around? A The Space Shuttle is in free fall, so the shuttle and the astronauts inside it are continuously falling toward the Earth. They thus experience apparent weightlessness. B There is no gravity in the Space Shuttle because it is too far away from the center of the Earth. C There is no gravity in the Space Shuttle because it is completely enclosed and shielded from the effects of gravity due to the Earth.
8500 (kg/m^3)
A 6.8-kg piece of metal displaces 0.80L of water when submerged. FInd its density. p=
8.5
A 6.8-kg piece of metal displaces 0.80L of water when submerged. how does this compare with the density of water? p/pw=
C
A hollow spherical planet is inhabited by people who live inside it, where the gravitational field is zero. When a very massive space ship lands on the planet's surface, inhabitants find that the gravitational field inside the planet is A still zero. B non-zero, directed away from the spaceship. C non-zero, directed toward the spaceship.
grapefruits
A kilogram of peaches have more skin area than a kilogram of grapes. blueberries. grapefruits. Each has the same skin area.
less than 1 liter
A liter-sized block of ordinary wood floats in water. The amount of water displaced is less than 1 liter. more than 1 liter. 1 liter. depends on the water density none of these
10,000 kg
A metal block has a density of 5000 kg per cubic meter and a volume of 2 cubic meters. What is the block's mass? 2500 kg 5000 kg 1000 kg 10,000 kg none of these
neon
If two protons are added to an oxygen nucleus, the result is heavy oxygen. fluorine. sodium. neon. nitrogen.
carbon
If two protons are removed from an oxygen nucleus, the result is carbon. helium. nitrogen. neon. positively charged oxygen.
A
If we doubled the magnifying power of the most powerful optical microscope in the world, we would A still not be able to see or photograph an atom. B be able to photograph individual atoms, even though we couldn't see them. C be able to see individual atoms.
the force you exert on the scale
If you are standing on a scale in an elevator, what exactly does the scale measure? your mass the force you exert on the scale the gravitational force exerted on you by Earth
overbaked
If you make cupcakes and bake them as directed for a cake, you will find the cupcakes properly baked. underbaked. overbaked.
A
If you want to cool down a drink with ice, which of the following would make it cool faster and why? A Crushing the lump into small pieces will put more of the ice's surface area is in contact with the drink. B Use one large lump of ice, because then you will have a larger amount of ice available to cool the drink. C Either a lump or an equal amount of crushed ice would produce the same cooling effect, because it is the amount that matters and not whether it is crushed or in one piece.
hydrogen
Which of the following is an element? Hydrogen Carbon dioxide H2O A supernova
net buoyant force will stay the same
uppose you increase the depth of the object WITHOUT changing its height. What will happen to the net buoyant force? The net buoyant force will increase. The net buoyant force will decrease. The net buoyant force will stay the same.
net buoyant force will increase
uppose you increase the height of the object WITHOUT changing its depth under water. What will happen to the net buoyant force? The net buoyant force stays the same. The net buoyant force will increase. The net buoyant force will decrease.
less taffy
A candymaker making taffy apples decides to use 100 kg of large apples rather than 100 kg of small apples. Will the candymaker need to make more or less taffy to cover the apples? less taffy more taffy
7.2 CM
A certain spring stretches 6.0cm when a load of 40N is suspended from it. A certain spring stretches 6.0cm when a load of 40N is suspended from it.
volume of fluid
A completely submerged object always displaces its own volume of fluid. density of fluid. weight of fluid. all of these none of these
both of these
A fish normally displaces its own volume of water. weight of water. both of these neither of these
have wave properties
An important feature of atoms is that they _______. make up electric beams have wave properties are actually tiny solar systems can barely be seen with the naked eye
is less
An iron block is placed in a furnace where it is heated and consequently expands. In the expanded condition, its density is more. is the same. is less.
neither sink nor float in water
An object having the same density as water will _______. neither sink nor float in water float on water sink in water displace less water than it weighs.
16 times as great
Compared to the mass of a hydrogen atom, the mass of an oxygen atom is appreciably more than 16 times as great. 12 times as great. 8 times as great. 16 times as great.
less
Compared to the volume of a kilogram of feathers, the volume of a kilogram of lead is the same. less. more.
0.001
Consider the fictional case of the incredible shrinking man. If he shrinks proportionately to 1/10 his original height, his weight will be multiplied by 0.001. 0.01. 0.1. 0.0001. none of these
0.01 times
Consider the fictional case of the incredible shrinking woman. If her height shrinks to 0.1 times her original height, then her total skin area shrinks to 0.001 times its original value. 0.0001 times its original value. 0.01 times its original value. 0.1 times its original value. none of these
density increases
If a loaf of bread is compressed, its molecules become harder. density decreases. surface tension becomes less. density increases. none of these
1 N
If an object suspended by a scale shows a weight of 3N in air, and 2 N when submerged in water, the buoyant force on the submerged object is _______. 1 N 2 N 3 N more than 3 N
100, but its weight by 1000
If each dimension of a steel bridge is scaled up ten times, its strength will be multiplied by about ten and its weight by ten also. one hundred, but its weight by one thousand. one thousand, and its weight by one hundred. none of these
helium
If one neutron is added to a helium nucleus, the result is beryllium. helium. hydrogen. boron. lithium.
double
If the mass of an object were to double while its volume remains the same, its density would halve. become four times as great. double. stay the same.
always false
No force due to Earth's gravity is acting on the astronauts inside the orbiting space shuttle. This statement is sometimes true while in orbit. always false. always true while in orbit.
height of the object
On what factors does the buoyant force acting on an object depend? both height of the object and depth under water height of the object depth under water
1 kilogram
One liter of water has a mass of 500 grams. 14.7 grams. 1 kilogram. none of the above choices
less than
Pumice is a volcanic rock that floats. Its density is equal to the density of water. more than the density of water. less than the density of water.
of electrical forces
Solid matter is mostly empty space. The reason solids don't fall through one another is because of electrical forces. atoms are constantly vibrating, even at absolute zero. of gravitational forces. of nuclear forces. none of these
compression
Stone slabs are stronger under compression. tension. both tension and compression.
large potatoes
Suppose all sized potatoes are selling at the same price per kilogram. If you peel them for mashing, you will get more potato for your money if you buy large potatoes. medium potatoes. small potatoes. makes no difference
less
Suppose you are in an elevator that is moving upward. As the elevator nears the floor at which you will get off, its speed slows down. During this time when the elevator is moving upward with decreasing speed, your weight will be __________. greater than your normal weight at rest equal to your normal weight at rest less than your normal weight at rest
greater
Suppose you are in an elevator. As the elevator starts upward, its speed will increase. During this time when the elevator is moving upward with increasing speed, your weight will be __________. greater than your normal weight at rest equal to your normal weight at rest less than your normal weight at rest
B
Suppose you increase the depth of the object WITHOUT changing its height. What will happen to the force due to pressure on the bottom of the object? A The force due to pressure on the bottom of the object will stay the same. B The force due to pressure on the bottom of the object will increase. C The force due to pressure on the bottom of the object will decrease.
B
Suppose you increase the height of the object WITHOUT changing its depth under water. What will happen to the force due to pressure on the bottom of the object? A The force due to pressure on the bottom of the object will stay the same. B The force due to pressure on the bottom of the object will increase. C The force due to pressure on the bottom of the object will decrease.
catenary
The name given to the shape of a sagging rope supported at its ends is a _______. parabola semi-circle catenary hyperbola
D
The reason that buoyant force acts upward on a submerged object is that A if it acted downward, nothing would float. B the weight of fluid displaced reacts with an upward force. C it acts in a direction to oppose gravity. D upward pressure against the bottom is greater than downward pressure against the top of the submerged object.
a quark
The smallest particle of those listed below is a neutron. an atom. a quark. a proton. a molecule.
thickness
The strength of a rope depends on its length. thickness. both of these
2.5 (m/s^2)
The value of g at Earth's surface is about 9.8 m/s2. What is the value of g at a distance of twice Earth's radius? g=
electrons
The volume of matter comes mostly from its electrons. neutrons protons.
sand
Two life preservers have identical volumes, but one is filled with Styrofoam while the other is filled with sand. When the two life preservers are worn by swimmers so that one swimmer floats with part of the preserver above water, and the other swimmer sinks, the buoyant force is actually greater on the life preserver filled with Styrofoam. sand. same
at the bottom
Water pressure in a lake is greater _______. midway to the bottom at the bottom at any point, for pressure is the same throughout at the surface
bottom
Water pressure is greatest against the top of a submerged object. bottom of a submerged object. sides of a submerged object. is the same against all surfaces none of these
9200 N
What is the weight of a cubic meter of ice? (For the density of ice, use 919kg/m3 .)
sphere
Which geometrical shape has the least surface area for a given volume? cube pyramid cylinder sphere none of these
C
Why do French fries cook faster when they are cut into thinner pieces, and why do meatballs cook faster when they are flattened? A There is less amount of food to cook in the thinner fries and flattened meat balls. B There is a smaller amount of surface area for the same amount of food in the thinner fries and flattened meatballs. C There is a greater amount of surface area for the same amount of food in the thinner fries and flattened meatballs.
both the same
You take 1000 mg of a vitamin and your friend takes 1g of the same vitamin. Who takes more vitamins? you your friend both the same
protons and neutrons
he weight of matter comes mostly from its protons and neutrons. electrons. empty spaces between atoms.
none of these
Consider two planets in space that gravitationally attract each other. If the masses of both planets are doubled, and the distance between them is also doubled, then the force between them is half as much. one quarter. four times as much. twice as much. none of these
4
Doubling the thickness (diameter) of a rope will multiply its strength by 2. 4. 1. 1/2. 3.
two
How many different elements are in a water molecule? none three two four one
molecular attractions
Surface tension is caused by _______. water's tendency to remain wet the interaction between air and a water surface molecular attractions temperature variations in liquids
A
What is the buoyant force that acts on a submerged object equal to? A The buoyant force is equal to the weight of the fluid displaced by the submerged object. B The buoyant force is equal to the weight of the object submerged. C The buoyant force is equal to both the weight of the fluid displaced and the weight of the object.
unchanged
When a chocolate bar is cut in half, its density is doubled. halved. unchanged.
a liter of water
Which has more mass, a liter of ice or a liter of water? a liter of ice a liter of water
the moon
Which is most responsible for the ocean tides? the moon the sun Both contribute equally.
less
A block of aluminum with a mass of 1 kg is placed in a beaker of water filled to the brim. Water overflows. The same is done in another beaker with a 1-kg block of lead. Does the lead displace more, less, or the same amount of water? more less the same amount
the same amount
A block of aluminum with a volume of 10 cm3 is placed in a beaker of water filled to the brim. Water overflows. The same is done in another beaker with a 10-cm3 block of lead. Does the lead displace more, less, or the same amount of water? more the same amount less
less
A block of aluminum with a weight of 10 N is placed in a beaker of water filled to the brim. Water overflows. The same is done in another beaker with a 10-N block of lead. Does the lead displace more, less, or the same amount of water? more the same amount less
more taffy
A candymaker is making taffy apples. If she buys 100 kg of small apples rather than 100 kg of large apples, she will need less taffy. the same amount of taffy. more taffy.
B
A dam is thicker at the bottom than at the top partly because A surface tension exists only on the surface of liquids. B water pressure is greater with increasing depth. C water is denser at deeper levels. D it looks better. E none of these
when the moon is high overhead
A high tide can occur __________. when the Moon is high overhead only when the Moon is full when the Moon is low in the sky (setting or rising)
less
A lobster crawls onto a bathroom scale submerged at the bottom of the ocean. Compared to its weight above the surface, the lobster will have an apparent weight under water that is the same. less. greater.
3 cubic meters
A metal block has a density of 5000 kg per cubic meter and a mass of 15,000 kg. What is its volume? 0.33 cubic meters 5 cubic meters 15 cubic meters 3 cubic meters none of these
5 cm
A spring is stretched 10 cm by a suspended 1-kg block. If two such springs side-by-side are used to suspend the block, so each spring supports half the weight of the block, then each spring will stretch 30 cm. 20 cm. 10 cm. 5 cm. none of these
volume of water
A stone submerged in water displaces its _______. density × volume volume and weight of water weight of water volume of water
D
A strong spring is stretched 10 cm by a suspended weight. If the weight is doubled, the spring will stretch A another 5 cm, making the total stretch 15 cm. B no more. C another 30 cm, making the total stretch 40 cm. D another 10 cm, making the total stretch 20 cm. E more than another 30 cm.
100 N
A weight watcher who normally weighs 400 N 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? 400 N 0 100 N 200 N none of these
20 cm
A weightless spring is stretched 10 cm by a suspended 1-kg block. If two such springs are used to suspend the block, one spring above the other, to effectively provide one double-length spring, then the total stretch of the double-length spring will be 10 cm. 30 cm. 5 cm. 20 cm. none of these
500 kg
A wooden block has a mass of 1000 kg and a volume of 2 cubic meters. What is the block's density? 500 kg per cubic meter 200 kg per cubic meter 1000 kg per cubic meter 100 kg per cubic meter none of these
twice as much
According to Hooke's law, if you double the force when stretching a spring, the elongation of the spring is normally _______. no different, the same half as much twice as much four times as much
B
According to Newton, doubling the distance between two interacting objects A divides by 2 the gravitational force between them. B divides by 4 the gravitational force between them. C multiplies by 4 the gravitational force between them. D multiplies by 2 the gravitational force between them.
40 N
An asteroid exerts a 360-N gravitational force on a nearby spacecraft. If the spacecraft moves to a position three times as far from the center of the asteroid, the force will be 360 N. 120 N. 1080 N. zero. 40 N.
toward the asteroid
An asteroid exerts a 360-N gravitational force on a nearby spacecraft. This force is directed toward the sun. away from the asteroid. toward the asteroid.
a carbon atom
An atomic mass unit (amu) is 1/12 the mass of a proton. a uranium atom. a carbon atom. a hydrogen atom. an electron.
A
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 A the density of salt water exceeds the density of egg. B buoyant force does not always act upward. C salt sinks to the bottom. D calcium in the egg shell is repelled by sodium chloride.
earth
An object is placed exactly halfway between the Earth and moon. The object will fall toward the moon. Earth. neither of these
70 cm
An unstretched hanging spring is 50 cm long. Suspending a 100-N weight from it makes its length 60 cm. Adding another 100-N weight will make the spring's length 60 cm. 70 cm. 100 cm. 80 cm. 120 cm.
6 hours
Approximately how much time passes between low and high tide? 4 hours 6 hours 12 hours 24 hours
d
As you found in Part A, your weight will be greater than normal when the elevator is moving upward with increasing speed. For what other motion would your weight also be greater than your normal weight? A The elevator moves upward with constant velocity. B The elevator moves downward with constant velocity. C The elevator moves upward while slowing in speed. D The elevator moves downward while slowing in speed. E The elevator moves downward while increasing in speed.
single breath
Assuming all the atoms exhaled by Julius Caesar in his last dying breath are still in the atmosphere, then we probably breathe one of those atoms with each ten years. day. It depends - some people still breathe a few of Caesar's atoms every day, while others wouldn't breathe one for an entire year. single breath. month.
feet
Blood pressure is normally greater in your feet. ears. same in each
D
Brownian motion has to do with the A size of atoms. B first direct measurement of atomic motion. C rhythmic movements of atoms in a liquid. D random motions of atoms and molecules. E atomic vibrations.
1 kg block of aluminum
Buoyant force is greatest on a submerged 1-kg block of aluminum. is the same on each 1-kg block of lead.
3.7 N
Calculate the force of gravity on a 1-kg mass at Mars's surface. The mass of Mars is 6.4×10^23kg , and its radius is 3.4×10^6m f=(Gm^1M^2)/(d^2)
the same
Compared to a bar of pure gold, the density of a pure gold ring is slightly more. the same. less. much more.
lower in the water
Compared to an empty ship, the same ship loaded with Styrofoam will float lower in the water. at the same level in the water. higher in the water.
the same age
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 actually older. newer. the same age.
more
Compared to the density of a kilogram of feathers, the density of a kilogram of lead is less. the same. more.
plentiful in the universe
Dark matter is considered to be _______. a local phenomenon a form of dark energy at the center of all atomic nuclei plentiful in the universe
two high tides and two low tides
Each day _______________. there is one high tide and one low tide there are two high tides and two low tides there are three high tides and three low tides the number of tides depends on the seasons
less
Eight little spheres of mercury coalesce to form a single sphere. Compared to the combined surface areas of the eight little spheres, the surface area of the big sphere is less. greater. the same.
eliminates the role of force
Einstein's theory of gravitation, compared with Newton's, _______. is one and the same eliminates the role of force enhances the role of force more greatly emphasizes the inverse-square law
B
From Part B, you know that from afar we'll never see the in-falling rocket cross the event horizon, yet it will still eventually disappear from view. Why? A Even though you won't see it cross the event horizon, it does cross it and that means you can no longer see it. B Its light will become so redshifted that it will be undetectable. C The black hole's blackness will drown out the light of the rocket. D Tidal forces will squeeze the in-falling rocket to an undetectably thin line.
B
From the viewpoint of an observer in the orbiting rocket, what happens to time on the other rocket as it falls toward the event horizon of the black hole? A Time runs increasingly faster as the rocket approaches the black hole. B Time runs increasingly slower as the rocket approaches the black hole. C Time is always the same on both rockets.
zero
Half way to the center of a completely hollow planet with a thin uniform shell, your weight would be one-quarter of your weight on the surface. one-half of your weight on the surface. the same as at the surface. three-quarters of your weight on the surface. zero.
b
How does the gravity in the Space Shuttle compare with the gravity on Earth's surface? A The gravity in the Space Shuttle is much smaller than the gravity on Earth's surface. B The gravity in the Space Shuttle is approximately equal to the gravity on the surface of the Earth. C The gravity in the Space Shuttle is much larger than the gravity on Earth's surface.
3
How many individual atoms are in a water molecule?
9.8 N
How much force is needed to hold a nearly weightless but rigid 1-L carton beneath the surface of water? F=
C
If the Earth's mass decreased to one-half its original mass with no change in radius, then your weight would A decrease to one quarter your original weight. B stay the same. C decrease to one half your original weight. D none of these
increase also
If the mass of the Earth somehow increased with no change in radius, your weight would stay the same. decrease. increase also.
halve
If the volume of an object were to double while its mass stays the same, its density would double. become four times as great. stay the same. halve
A
If there were no Moon, would there still be tides on Earth? A Yes, because the Sun's gravity still has an influence. B Yes, because the Earth is still rotating. C No, the Moon is essential to our tides.
carbon
If two protons and two neutrons are removed from the nucleus of an oxygen atom, what nucleus remains?
B
If you want to light some wood on fire, what would most likely make the wood light, and why? A Either having the complete log of wood or small pieces of wood would work equally well, because it is the same amount of wood. B Breaking the log down into small pieces of wood will increase the amount of wood surface that can catch fire. C Answer #1 Using a complete log of wood will provide a larger amount of wood for lighting.
C
If you were inside the rocket that falls toward the event horizon, from your own viewpoint you would __________. A slow down and come to a stop at the event horizon B slow down and cross the event horizon at low speed C accelerate as you fall and cross the event horizon completely unhindered
mittens
In cold weather, your hands will be warmer if you wear gloves. mittens. Both will be the same.
short-lived
In our part of the universe, antimatter is short-lived. plentiful. long-lived. non-existent.
apparent weight for you
Inside a freely falling elevator, there would be no gravitational force on you. apparent weight for you. both of these none of these
apparent weight is zero
Inside a freely falling runaway elevator, your apparent weight is zero. acceleration is zero. gravitational interaction with the Earth is zero. all of these none of these
yes
Is gravitational force acting on an astronaut inside an orbiting space shuttle? yes no
greater than
Lobsters live on the bottom of the ocean. The density of a lobster is equal to the density of sea water. greater than the density of sea water. less than the density of sea water.
that gravity is universal
Newton discovered that gravity is universal. gravity. neither
D
Surface tension is a direct result of A adhesive forces between molecules in a liquid or solid. B viscosity. C Bernoulli's principle. D cohesive forces between molecules in a liquid. E Archimedes' principl
B
The Moon's gravitational pull is _________. A strongest on the side of Earth farthest from the Moon B strongest on the side of Earth closest to the Moon C the same on both sides of Earth
A
The amount of gravitational force that acts on the space shuttle while in orbit is A almost as much as the shuttle's weight on the Earth's surface. B the same as the shuttle's weight on the Earth's surface. C nearly zero.
equal to the objects weight
The buoyant force on a floating object is _______. more than the buoyant force if submerged less than the object's weight equal to the object's volume equal to the object's weight
partly submerged
The buoyant force on an object is least when the object is partly submerged. submerged near the bottom. submerged near the surface. none of these
their water levels are the same
The caissons of the Falkirk Wheel are balanced only when _______. boats are not heavily loaded they carry boats of equal weights the same number of boats is in each their water levels are the same
negative
The charge in the nucleus of an antimatter hydrogen atom is _______. positive neutral, no charge negative exotically different than positives and negatives
water
The density of a submerged submarine is about the same as the density of water. iron. a floating submarine. a crab. none of these
surface escape velocity
The factor most directly responsible for making a black hole invisible is its mass. size. surface escape velocity. color. none of these
newton per square meter
The pascal is a pressure unit equal to one newton per square centimeter. newton per square meter. square meter per newton. kilogram per square centimeter. kilogram per square meter.
surface area of the water
The pressure at the bottom of a jug filled with water does NOT depend on the acceleration due to gravity. water density. the height of the liquid. surface area of the water. none of these
both of these
The pressure in a liquid depends on liquid density. depth. both of these neither of these
mostly empty space themselves
The reason a granite block is mostly empty space is that the atoms in the granite are held together by electrical forces. invisible. not as close together as they could be. in perpetual motion. mostly empty space themselves.
E
The reason a life jacket helps you float is A the jacket has the same density as an average human. B if you sink, the jacket sinks. C the jacket repels water. D the jacket makes you weigh less. E the density of both you and the jacket together is less than your density alone.
A
The volume of water displaced by a floating 20-ton boat A is the volume of 20 tons of water. B is 20 cubic meters. C depends on the shape of the ship's hull. D is the volume of the boat. E none of these
same on each
Two life preservers have identical volumes, but one is filled with Styrofoam while the other is filled with sand. When the two life preservers are fully submerged, the buoyant force is greater on the one filled with sand. Styrofoam. same on each as long as their volumes are the same
10 tons
What is the buoyant force acting on a 10-ton ship floating in the ocean? depends on density of sea water more than 10 tons less than 10 tons 10 tons
B
When Dr. Hewitt immerses an object in water the second time and catches the water that is displaced by the object, how does the weight lost by the object compare to the weight of the water displaced? A The weight loss of the object is less than the weight of the water displaced. B The weight loss of the object is equal to the weight of the water displaced. C The weight loss of the object is greater than the weight of the water displaced.
equal
When Dr. Hewitt immerses the object in water, how does the loss of weight of the object compare with the buoyant force of the water? Loss of weight is greater than the buoyant force. Loss of weight is equal to the buoyant force. Loss of weight is less than the buoyant force.
higher in the water
When a boat sails from fresh water to salt water, the boat will float higher in the water. lower in the water. at the same water level.
4
When a living cell doubles in diameter, the amount of its material to be nourished is multiplied by eight, but the amount of membrane through which to feed it is multiplied by more than 8. 2. 8. 4.
tension
When a load is placed on the middle of a horizontal beam supported at each end, the bottom part of the beam undergoes tension. compression.
remains the same
When a star collapses to form a black hole, its mass increases. remains the same. decreases.
neutral layer
When a tree branch is bent, the region in the center of the branch is the _______. compressed layer neutral layer tensile layer elastic layer
B
When an object is partly or wholly immersed in a liquid, it is buoyed up A by a force equal to its own weight. B by a force equal to the weight of liquid displaced. C but nevertheless sinks. D and floats because of Archimedes principle. E none of these
given off by the reaction
When carbon and oxygen atoms combine, energy is taken in by the reaction. not involved. given off by the reaction.
bottom of the tower
When holes are drilled through the wall of a water tower , water will spurt out the greatest horizontal distance from the hole closest to the top of the tower. the bottom of the tower. the middle of the tower. The horizontal distance will be the same for all holes.
compression
When weight is applied to the top of a stone arch, all of the stone blocks in the arch undergo change of phase. compression. expansion. tension.
equal than your weight
When you float in fresh water, the buoyant force that acts on you is equal to your weight. When you float higher in the high-density water of the Dead Sea, the buoyant force that acts on you is less than your weight. equal to your weight. greater than your weight.
mouse
Which has more skin compared to its body weight, an elephant or a mouse? mouse elephant typically, both the same
elephant
Which has more skin, an elephant or a mouse? elephant mouse typically, both the same
a kilo of aluminum
Which has more volume, a kilogram of gold or a kilogram of aluminum? a kilogram of gold a kilogram of aluminum
both have the same density
Which has the greater density, a lake full of water or a cup full of lake water? the cup full of lake water the lake full of lake water Both have the same density. It is impossible to tell without knowing the size of the lake.
a grape
Which of the following has the greatest outer surface area per volume? An elephant A peach A tiger A grape
an elephant
Which of the following has the greatest outer surface area? A grape An elephant A peach A tiger
water
Which of the following is not an element: hydrogen, carbon, oxygen, water? hydrogen carbon oxygen water
an ant
Which of the following is stronger per body weight? An ant A fish An elephant A human
C
Which of the following items would remain without rusting longer: a solid lump of steel, or steel wool that weighs the same amount? A Both the lump of steel and the steel wool would rust equally fast because the amount of steel in them is the same. B The steel wool would stay without rusting longer because there is not as much of it. C The lump of steel would stay without rusting longer, because not as much of it comes in contact with the air.
(1st quarter, 3rd quarter), (new,full)
Which of the following lists correctly gives, in increasing order, the height of the high tides that occur during particular lunar phases? (Ties are denoted by parentheses.) (new, full), (first quarter, third quarter) new, full, first quarter, third quarter (first quarter, third quarter), (new, full) first quarter, third quarter, full, new
uranium
Which of these atoms has the greatest number of electrons? gold uranium helium carbon iron
gold
Which of these atoms has the largest number of neutrons in the nucleus? Hydrogen Gold Helium Carbon
uranium
Which of these atoms has the most mass? lead uranium iron hydrogen All have the same mass.
steel
Which of these is most elastic? Steel Air Water Putty
B
Why did the particles jiggle around? A The particles were struck equally on all sides by atoms that were moving around. B The particles were struck by atoms, but unequally on different sides. C There was a constant external force that propelled the particles.
B
Why does the gravity in the Space Shuttle compare with the gravity on Earth the way it does? A The Space Shuttle is much closer to the center of the Earth than the surface of the Earth. B The Space Shuttle is about the same distance from the center of the Earth than from the surface of the Earth. C The Space Shuttle is much farther away from the center of the Earth than the surface of the Earth.
