PH 104 Exam 2
10 newtons
A 1-kg balloon at equilibrium in the air is buoyed up with a force of _______. - 1 newton - 1 kilogram - 10 newtons - 12 newtons
weight of air it displaces.
A balloon is buoyed up with a force equal to the - atmospheric pressure. - weight of air it displaces. - density of surrounding air. - weight of the balloon and contents. - all of these
600 m
A bullet is fired horizontally with an initial velocity of 300 m/s from a 20-m high tower. If air resistance is negligible, the bullet hits downrange about - 500 m. - 300 m. - 400 m. - 200 m. - 600 m.
that of a column of water 10.3 meters tall
A column of mercury 76 cm tall has a weight that is equal to _______. - normal atmospheric pressure - 13.6 times the density of water - the weight of Earth's atmosphere - that of a column of water 10.3 meters tall
all of the above
A consequence of surface tension for water is - the different tastes of hot and cold oily soup. - wet sand being firmer than dry sand. - capillary action. - all of the above - none of the above
altitude
Atmospheric pressure decreases with increasing _______. - amounts of sunshine - speed of molecules in the air - temperature - altitude
insects in water
Capillarity is a liability for _______. - insects in water - tree branches - plant growth - oil wicks
lower in the water.
Compared to an empty ship, the same ship loaded with Styrofoam will float - at the same level in the water. - lower in the water. - higher in the water.
low specific heat capacity
Does a substance that heats up quickly have a high or a low specific heat capacity? - high specific heat capacity - low specific heat capacity
4 and its volume by 8.
Doubling the linear size of an object multiplies its area by - 8 and its volume by 16. - 2 and its volume by 4. - 4 and its volume by 8. - none of the above
5 meters
How far below a straight-line path does a horizontally projected projectile fall in the first second of fall? - Depends on the projected speed - 10 meters - Zero meters - 5 meters
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
independent of each other
The horizontal and vertical components of velocity for a projectile are _______. - dependent on each other - equal for angles greater than 45° - parts of a parabola - independent of each other
neither of these
To change mercury into gold, a pair of protons must be - added to the mercury nucleus. - removed from the mercury nucleus. - either of these - neither of these
small-diameter piston.
To multiply an applied force while using a simple hydraulic lift, your force should be applied to the - large-diameter piston. - relative piston sizes don't matter. - small-diameter piston.
4°C
Water is most dense at _______. - 4°C - 100°C - 0°C - less than 0°C
at the bottom
Water pressure in a lake is greater _______. - at the bottom - at the surface - midway to the bottom - at any point, for pressure is the same throughout
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 decreases to one quarter. - The force remains the same. - The force doubles.
The force quadruples.
What happens to the force of attraction between two planets when the masses of both are doubled? - The force increases by 16. - The force quadruples. - The force doubles. - The force remains the same.
100 tons
What is the weight of water displaced by a 100-ton floating ship? - depends on the ship's shape - 100 cubic meters - more than 100 tons - 100 tons - less than 100 tons
Gold
Which of the following has the greatest density? - All the same - Uranium - Lead - Gold
water
Which of these has the highest specific heat capacity? - Iron - Soil - Water - Silver
1 Calorie
Which of these is the largest amount of energy? - 10 calories - 1 Calorie - 5 joules - 100 calories
silver
Which warms up faster when heat is applied - iron or silver? - silver - iron
directly beneath the plane
While an airplane flies at 40 m/s at an altitude of 500 meters, the pilot drops a heavy package that falls to the ground. Neglecting air drag, about where does the package land relative to the plane flying above? - 500 m behind the plane - 400 m behind the plane - directly beneath the plane - more than 500 m behind the plane - none of the above
becomes less ordered
As entropy in a system increases, energy in the system _______. - becomes less ordered - becomes more ordered - moves toward destruction - reaches equilibrium
Ageless
As the text cites, atoms are incredibly tiny, numerous, perpetually moving, and what else? - Migratory - Ageless - New in science - Mainly in the air
weight of air
Atmospheric pressure is mainly due to the _______. - average temperature of air - weight of air - air pressure against Earth's surface - motion of air molecules
both of these
Atoms can be photographed by - scanning electron microscopes. - electron beams. - both of these - neither of these
pressure is sufficiently lowered
Boiling can occur in cold water when _______. - pressure is sufficiently increased - concentration and physics come together - sub-zero temperatures are achieved - pressure is sufficiently lowered
below the surface and throughout water
Boiling is evaporation that mainly occurs _______. - at the bottom of a container of heated water - when water becomes overly hot - at the surface of water - below the surface and throughout water
resonance.
Caruso is said to have made a crystal chandelier shatter with his voice. This is a demonstration of - interference. - sound refraction. - an echo. - beats. - resonance.
black pot
Cold water will warm to room temperature faster in a - silver pot. - black pot. - depends more on the size of the pots than their color
from gas to liquid
Condensation is a change of phase _______. View Available Hint(s) - from solid or liquid to gas - without energy transfer - from gas to liquid - from liquid to gas
yes
Does Newton's law of cooling apply to warming as well as to cooling? - no - yes
The force due to pressure on the bottom of the object will increase.
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? - The force due to pressure on the bottom of the object will decrease. - The force due to pressure on the bottom of the object will increase. - The force due to pressure on the bottom of the object will stay the same.
The net buoyant force will increase.
Suppose 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 will increase. - The net buoyant force stays the same. - The net buoyant force will decrease.
1 calorie
The amount of heat needed to raise the temperature of 1 gram of water by 1°C is _______. - 1 newton - 1 joule - 1 calorie - 1 joule or 1 calorie, as both are the same
20 hertz to 20,000 hertz.
The approximate range of human hearing is - 10 hertz to 10,000 hertz. - 20 hertz to 20,000 hertz. - 40 hertz to 40,000 hertz. - Actually all of these - depends on the hearing ability of the person.
6 hertz.
The beat frequency produced when a 240 hertz tuning fork and a 246 hertz tuning fork are sounded together is - 240 hertz. - 12 hertz. - 6 hertz. - 245 hertz. - None of the above choices are correct.
10 tons.
The buoyant force acting on a 10-ton ship floating in the ocean is - depends on density of sea water - more than 10 tons. - less than 10 tons. - 10 tons.
equal to the object's weight
The buoyant force on a floating object is _______. - equal to the object's volume - less than the object's weight - more than the buoyant force if submerged - equal to the object's weight
makes the units of measurement consistent
The constant G in Newton's equation _______. - was measured by Newton - makes the units of measurement consistent - shows gravity to be a relatively huge force - produces equilibrium
high frequency
The relation ƒ ~ T tells us that high-temperature sources emit electromagnetic waves of _______. - long wavelength - slow frequency - high penetrating power - high frequency
cold to hot without external energy
The second law of thermodynamics tells us that heat doesn't flow from _______. - hot to cold ever - cold to hot ever - hot to cold without external energy - cold to hot without external energy
vibrating.
The source of every sound is something that is - accelerating. - undergoing simple harmonic motion. - vibrating. - moving. - a net emitter of energy.
wavelength
The speed of a wave can be found by multiplying its frequency by its _______. - amplitude - density - period - wavelength
air temperature
The speed of sound in air varies with _______. - pitch - frequency - speed of the source - air temperature
along the direction of wave travel.
The vibrations of a longitudinal wave move in a direction - along the direction of wave travel. - at right angles to the direction of wave travel. - that changes with speed.
radiation.
Wrapping a hot potato in aluminum foil significantly reduces the rate at which it cools by - radiation. - condensation. - evaporation. - conduction.
is a better insulator than tile.
Your feet feel warmer on a rug than on a tile floor because a rug - is a better insulator than tile. - is usually warmer than tile. - for the same mass has more internal energy than tile. - all of these - none of these
energy
_______ travels in a wave from one location to another. - amplitude - frequency - wavelength - energy
sounding boards
Forced vibrations mainly occur in _______. - guitar strings - wind instruments - tuning forks - sounding boards
None of the above choices are true.
When an ideal gas is subjected to an adiabatic process - the temperature of the gas does not change. - the internal energy of the gas does not change. - no work is done on the gas. - Choices A, B, and C are all true. - None of the above choices are true.
larger
When an iron ring is heated, the hole becomes - smaller. - larger. - neither smaller nor larger. - either smaller or larger, depending on the ring thickness.
energy in transit
When we speak about heat, we refer to _______. - work - transfer of kinetic energy - energy in transit - temperature
Speed, gravitational force, and distance from Earth
For an Earth satellite in an elliptical orbit, list all the values that do change. - Speed, gravitational force, and distance from the Sun and Earth - Speed - Speed, gravitational force, and distance from Earth - Speed and gravitational force
Only speed, gravitational force, and distance from Earth
For an Earth satellite in circular orbit, list all the values that do not change. - Speed and gravitational force only - Speed, gravitational force, and distance from the Sun and Earth - Speed only - Only speed, gravitational force, and distance from Earth
The crests and troughs of one wave should align with the troughs and crests of the other wave respectively.
For complete destructive interference between two waves, how must their crests and troughs align with each other? - The crests and troughs of one wave should align with the crests and troughs of the other wave respectively. - The crests and troughs of one wave should align with the zero crossing points of the other wave. - The crests and troughs of one wave should align with the troughs and crests of the other wave respectively.
goes up.
For increased atmospheric pressure, the boiling temperature of a liquid - goes up. - goes down. - remains at 100 degrees C.
The added wave must have the same amplitude, the same wavelength, and a phase difference of 0 degrees with respect to the original wave.
Given a wave of a particular wavelength and amplitude, what must be the amplitude, wavelength, and phase change of a wave you add to this wave to create a wave of twice the amplitude? - The added wave must have twice the amplitude, the same wavelength, and a phase difference of 180 degrees with respect to the original wave. - The added wave must have the same amplitude, twice the wavelength, and a phase difference of 0 degrees with respect to the original wave. - The added wave must have the same amplitude, the same wavelength, and a phase difference of 0 degrees with respect to the original wave. - The added wave must have twice the amplitude, twice the wavelength, and a phase difference of 0 degrees with respect to the original wave. - The added wave must have the same amplitude, the same wavelength, and a phase difference of 180 degrees with respect to the original wave.
1/20 second
If the frequency of a particular wave is 20 Hz, its period is _______. - more than 20 seconds - 20 seconds - 1/20 second - also 20 Hz
Electric
What type of force holds atoms together in a crystal? - Gravitational - Electromagnetic - Magnetic - Electric
Robert Brown
Which investigator is credited for discovering Brownian motion? - Robert Brown - John Dalton - Robert Motion - Albert Einstein
Electrons
Which of the following are negatively charged? - Atomic nuclei - Neutrons - Protons - Electrons
like the satellite, pulled by Earth's gravitation.
A weightless astronaut in an orbiting satellite is - like the satellite, pulled by Earth's gravitation. - shielded from Earth's gravitational field. - beyond the pull of gravity. - none of the above
5 meters
About how far below a straight-line path does a satellite in close Earth orbit fall in the first second of fall? - Zero meters - 5 meters - 10 meters - Depends on the projected speed
twice as much
According to Hooke's law, if you double the force when stretching a spring, the elongation of the spring is normally __________. - twice as much - four times as much - half as much - no different, but the same
the universe moving to a more disordered state
According to the second law of thermodynamics, is the universe moving to a more ordered state or to a more disordered state? - the universe moving to a more ordered state - the universe moving to a more disordered state
air speed increases there
Air pressure over the surface of a bird's wings decreases when _______. - air speed increases there - air speed decreases there - the wing is tilted downward - turning motion is executed
an increase in temperature
Air that is rapidly compressed undergoes _______. - a decrease in internal energy - an increase in temperature - a decrease in temperature - a decrease in pressure
Bernoulli's principle.
Airplane flight best illustrates - Bernoulli's principle. - Boyle's law. - Archimedes' principle. - Pascal's principle.
freely falling around Earth.
An Earth satellite is simply a projectile - floating motionless in space near Earth. - freely falling around Earth. - approaching Earth from outer space.
protons
An element is distinct because of its number of - the total mass of all the particles. - neutrons. - electrons. - protons. - none of the above
have wave properties
An important feature of atoms is that they __________. - have wave properties - make up electric beams - can barely be seen with the naked eye - are actually tiny solar systems
neither sink nor float in water
An object having the same density as water will _______. View Available Hint(s) - sink in water - float on water - displace less water than it weighs. - neither sink nor float in water
None of the above choices are correct.
An object that completes 100 vibrations in 5 seconds has a period of - 1 second. - 0.5 second. - 2 seconds. - None of the above choices are correct.
70 cm
An un-stretched hanging spring is 50 cm long. Suspending a 100-N block from it increases its length to 60 cm. Adding another 100-N block makes the spring's length - 80 cm. - 100 cm. - 60 cm. - 120 cm. - 70 cm.
Volume
As a sample of gas at 0°C is cooled, which of the following decreases by 1/273 for each degree cooled? - Volume - Temperature - Thermal energy - Mass
a transfer of energy
Changes of phase almost always require _______. - electron transfer - a condition of thermal equilibrium - a transfer of energy - an absence of molecular contact
The added wave must have the same amplitude, the same wavelength, and a phase difference of 180 degrees with respect to the original wave.
Given a wave of a particular wavelength and amplitude, what must be the amplitude, wavelength, and phase change of a wave you add to the existing wave to completely destroy it? - The added wave must have the same amplitude, the same wavelength, and a phase difference of 180 degrees with respect to the original wave. - The added wave must have the same amplitude, twice the wavelength, and a phase difference of 0 degrees with respect to the original wave. - The added wave must have the same amplitude, the same wavelength, and a phase difference of 0 degrees with respect to the original wave. - The added wave must have twice the amplitude, the same wavelength, and a phase difference of 180 degrees with respect to the original wave. - The added wave must have twice the amplitude, twice the wavelength, and a phase difference of 0 degrees with respect to the original wave.
less than that of plants
Hot sand cools off faster at night than do plants and vegetation. This indicates that the specific heat capacity for sand is _______. - less than that of plants - unrelated to rate of cooling - likely the same as that of plants - more than that of plants
You can either halve the wavelength, keeping the wave speed constant; or double the wave speed, keeping the wavelength constant.
How can you double the frequency of a wave if you have control over both the wavelength and the wave velocity? - You can either halve the wavelength, keeping the wave speed constant; or double the wave speed, keeping the wavelength constant. - The only way is to do this is to halve the wavelength, keeping the wave speed constant. - The only way is to do this is to double the velocity, keeping the wavelength constant.
The amount of infrared radiation would decrease.
How would decreasing the percentage of greenhouse gases affect the amount of infrared radiation reflected by the atmosphere back toward Earth? - The amount of infrared radiation would stay the same. - The amount of infrared radiation would decrease. - The amount of infrared radiation would increase.
The amount of infrared radiation would increase.
How would increasing the density of air in the atmosphere affect the amount of infrared radiation returned by the atmosphere back toward Earth? - The amount of infrared radiation would stay the same. - The amount of infrared radiation would increase. - The amount of infrared radiation would decrease.
a low specific heat
If a certain material heats up quickly and cools down quickly, the material has _______. - no specific heat to speak of - a high specific heat - a low specific heat - something besides specific heat that is different
1N
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
double
If the mass of an object were doubled while its volume remained the same, its density would - stay the same. - double. - be half. - be four times as great.
5 m
If you throw a stone horizontally from the top of a cliff, one second after leaving your hand its vertical distance below the top of the cliff is - 10 m. - 5 m. - 15 m.
an igloo.
If you were caught in freezing weather with only a candle for heat, you would be warmer in - an igloo. - a tent. - a car. - a wooden house.
temperature
Internal energy undergoes changes when there are corresponding changes in _______. - heat flow - mass - temperature - pressure
terrestrial and cosmic laws
Isaac Newton synthesized _______. - the pulls of the planets on one another - terrestrial and cosmic laws - the pulls of the Moon and the Earth - the extent to which gravity extends in the universe
elliptical paths
Kepler was the first to be credited for discovering that planets follow _______. - elliptical paths - parabolas - curved paths - circular paths
opposite processes
Melting and freezing are _______. - processes that bypass energy transfers - one and the same at the atomic level - opposite processes - not related to thermal processes
vaporizes
Most energy transfer occurs in water when it _______. - freezes - melts - vaporizes - increases from its melting temperature to its boiling temperature
100°C boiling water to 100°C steam
Most energy transfer occurs when 1 gram of H2O changes from _______. - 0°C ice to 0°C water - 100°C boiling water to 100°C steam - 0°C water to 100°C boiling water - any of these, for all involve the same amount of energy
a lower temperature than at sea level.
Near the top of a mountain, water in an open pot boils at - the same temperature as at sea level. - a lower temperature than at sea level. - a higher temperature than at sea level. - None of the above choices are true.
cooling or warming
Newton's law of cooling applies to objects that undergo _______. - only cooling - only warming - cooling or warming - neither cooling nor warming
height of the object
On what factors does the buoyant force acting on an object depend? - depth under water - both height of the object and depth under water - height of the object
no support force
One's weightlessness in space has most to do with _______. - rotational effects - one's mass - no gravity - no support force
Before the plane is directly over the target
The crew of a cargo plane wishes to drop a crate of supplies on a target below. To hit the target, when should the crew drop the crate? Ignore air resistance. - Before the plane is directly over the target - When the plane is directly over the target - After the plane has flown over the target
organization to disorganization
The direction of natural processes is from states of _______. - disorganization to organization - organization to disorganization - lower order to higher order - disorder to equilibrium
the conservation of energy
The first law of thermodynamics is a restatement of _______. - the conservation of momentum - the conservation of energy - both energy and momentum conservation - neither energy nor momentum conservation
40%.
The ideal efficiency for a heat engine operating between the temperatures of 227 degrees C and 27 degrees C is - 20%. - 25%. - 88%. - 40%. - none of these
colder
The inside surface of a glass window becomes wet when the temperature outside is _______. - either warmer or colder - warmer - almost exactly the same as on the inside - colder
a circular path
The kinetic energy of a satellite remains constant when the satellite follows _______. - any path whatever - an elliptical path - a parabolic path - a circular path
protons
The mass of matter is due mostly to its - electrons. - protons. - both of these
high specific heat.
The moderate temperatures of islands throughout the world has much to do with water's - high specific heat. - high evaporation rate. - vast supply of internal energy. - poor conductivity. - absorption of solar energy.
all molecules in a liquid have a wide variety of speeds
Do the molecules in a liquid all have about the same speed, or do they have a wide variety of speeds? - all molecules in a liquid have about the same speed - all molecules in a liquid have a wide variety of speeds
Earth's surface
Earth's gravitational field is strongest at _______. - infinity, in principle - Earth's center - either the Earth's center or at its surface - Earth's surface
prevent cooling from occurring
The purpose of a pressure cooker is to _______. - lengthen the time of cooking - prevent cooling from occurring - quicken heating - lessen pressure while cooking
−273°C
The temperature of absolute zero is stated as _______. - 32°C - (−273°C) - 273 K - 4 kelvin
along and parallel to the wave
The vibrations along a longitudinal wave move in a direction _______. - perpendicular to the wave - along and parallel to the wave - both along and perpendicular to the wave - neither along nor perpendicular to the wave
an increase in temperature
When a parcel of air sinks in the atmosphere, there is usually _______. - a drop in its density - a drop in its heat content - an increase in temperature - what is called a temperature inversion
triples
When a party balloon is compressed to one-third its volume, gas pressure in the balloon _______. - is also one-third - triples - remains the same if temperature doesn't change - doubles
frequency
When a sound source approaches a stationary listener, the listener experiences an increase in sound _______. - frequency - wavelength - speed - speed, frequency, and wavelength
neutral layer
When a tree branch is bent, the region in the center of the branch is the __________. - neutral layer - elastic layer - tensile layer - compressed layer
decreases
When air rapidly expands, its temperature normally _______. - decreases - is unaffected, but not always - increases - remains unchanged
release energy.
When liquids change to a solid state, they - absorb energy. - release energy. - neither absorb nor release energy. - both absorb and release energy.
100 times the intensity
When sound at 60 decibels is boosted to 80 decibels, the sound has about _______. View Available Hint(s) - the same intensity - 10 times the intensity - 100 times the intensity - several 100 times the intensity.
increases to four times as much.
When the distance between two stars decreases by half, the force between them - decreases by one-half. - stays the same. - increases to four times as much. - decreases by one-quarter. - increases to twice as much.
decreases
When the speed of a fluid increases, internal pressure in the fluid _______. - decreases - increases - increases as the square of the increase - remains constant
also increases
When the temperature of a strip of iron is increased, the length of the strip _______. - decreases in width as it gets longer - may increase or decrease - also increases - decreases
pressure of a moving fluid.
When water is turned on in a shower, the shower curtain moves towards the water. This has to do with - surface tension. - pressure of a moving fluid. - capillary action. - heat capacity. - none of these
from either your foot or the tile depending on the temperature of the tile
When your foot stands on a tile floor, thermal energy always flows _______. - from your foot to the tile - from the tile to your foot - upward - from either your foot or the tile depending on the temperature of the tile
both the Sun and the Earth
Which body glows with electromagnetic waves? - only the Sun - only the Earth - both the Sun and the Earth - neither the Sun or the Earth
An elephant
Which of the following has the greatest outer surface area? - An elephant - A peach - A grape - A tiger
air
Which of the following is NOT a compound? - ammonia - air - water - salt - all are compounds
none of the above
Which of the following is NOT a mixture? - air - beach sand - cake - granite - none of the above
1 m
A 340-hertz sound wave travels at 340 m/s in air with a wavelength of - 1 m. - 100 m. - 10 m. - 1000 m. - None of the above choices are correct.
60 hertz and it travels at 30 m/s.
A 60-vibration-per-second wave travels 30 meters in 1 second. Its frequency is - 60 hertz and it travels at 30 m/s. - 30 hertz and it travels at 60 m/s. - 1800 hertz and it travels at 2 m/s.
either towards you or away from you.
A Doppler effect occurs when a source of sound moves - towards you. - either towards you or away from you. - away from you. - in a circle around you.
water pressure is greater with increasing depth.
A dam is thicker at the bottom than at the top partly because - water pressure is greater with increasing depth. - surface tension exists only on the surface of liquids. - it looks better. - water is denser at deeper levels. - none of these
electrically charged
A gas will become plasma when it is _______. - electrically charged - fluoresced - heated - fused
mostly empty space themselves.
A granite block is mostly empty space because the atoms in the granite are - invisible. - in perpetual motion. - not as close together as they could be. - held together by electrical forces. - mostly empty space themselves.
100 m
A gun with a muzzle velocity of 100 m/s is fired horizontally from a tower. Neglecting air resistance, how far downrange will the bullet be 1 second later? - 98 m - 50 m - 490 m - 100 m - none of the above
less volume of water is displaced.
A person floats higher in the dense water of the Dead Sea because - less volume of water is displaced. - of a greater buoyant force. - more volume of water is displaced.
60°
A projectile is launched at 30° above ground level. What other angle at the same speed will result in the same range? - 15° - any angle at 60° or greater - 60° - 45°
multiple echoes
A reverberation occurs when sound undergoes _______. - changes in frequency - repeated refractions - multiple echoes - amplified acoustics
volume of water
A stone submerged in water displaces its _______. - weight of water - volume and weight of water - density × volume - volume of water
at the surface will not freely enter the higher-pressure region in the compressed lungs.
A swimmer cannot use a long hose to snorkel more than a meter deep because air - is buoyed up leaving the swimmer breathless. - in the lungs cannot easily be expelled. - at the surface will not freely enter the higher-pressure region in the compressed lungs. - tends to liquify in the snorkel tube. - all of these
messiness.
Entropy measures - messiness. - temperature at constant volume. - temperature as volume increases. - temperature at constant pressure. - temperature as pressure increases.
the more energetic molecules are able to escape the liquid.
Evaporation is a cooling process because - heat is radiated during the process. - the more energetic molecules are able to escape the liquid. - the temperature of the remaining liquid decreases. - of conduction and convection. - none of these
The crests and troughs of one wave should align with the crests and troughs of the other wave respectively.
For maximum constructive interference between two waves, how must their crests and troughs align with each other? - The crests and troughs of one wave should align with the zero crossing points of the other wave. - The crests and troughs of one wave should align with the troughs and crests of the other wave respectively. - The crests and troughs of one wave should align with the crests and troughs of the other wave respectively.
radiation
Heat travels from the Sun to the Earth by the process of _______. - conduction - convection - radiation - conduction and convection, though radiation is greater
faster in helium than in air.
Inhaling helium increases the pitch of your voice. One reason for this is that sound travels - slower in helium than in air. - faster in helium than in air. - the same speed in helium, but the wavelength is greater.
all kinds of waves
Interference is a phenomenon that occurs primarily in _______. - sound waves - light waves - water waves - all kinds of waves
sound, light, and water waves
Interference is a property of _______. - mainly water waves - mainly light waves - mainly sound waves - sound, light, and water waves
low thermal conductivity of the coals.
One of the main reasons one can walk barefoot on red-hot coals of wood without burning the feet has to do with - low thermal conductivity of the coals. - low temperature of the coals. - mind over matter techniques.
speed
Refraction of sound occurs with changes in wave _______. - frequency - speed - amplitude - temperature
matches natural frequency
Resonance occurs when forced vibration _______. - interferes with natural vibration - is sympathetic to amplitude - exceeds natural frequency - matches natural frequency
warm
Sound travels faster in air if the air temperature is - cold. - average. - warm.
compressions and rarefactions
Sound travels from one place to another mainly in a series of _______. - compressions - rarefactions - humps - compressions and rarefactions
interference
Standing waves are produced by _______. - diffraction - interference - amplitude changes - frequency changes
compression
Stone slabs are stronger under - compression. - tension. - both of these - none of these
all of these
Substances absorb heat energy by the process of - radiation. - conduction. - convection. - all of these
less than your normal weight at rest
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 than your normal weight at rest
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
The force due to pressure on the bottom of the object will increase.
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? View Available Hint(s) - The force due to pressure on the bottom of the object will increase. - The force due to pressure on the bottom of the object will decrease. - The force due to pressure on the bottom of the object will stay the same.
The net buoyant force will stay the same.
Suppose you increase the depth of the object WITHOUT changing its height. What will happen to the net buoyant force? - The net buoyant force will stay the same. - The net buoyant force will decrease. - The net buoyant force will increase.
molecular attractions
Surface tension is caused by _______. - molecular attractions - water's tendency to remain wet - temperature variations in liquids - the interaction between air and a water surface
Moon has a sufficient tangential speed.
The Moon does not crash into Earth because - gravitational pull of other planets keeps the Moon up. - Moon has less mass than Earth. - Moon has a sufficient tangential speed. - Earth's gravitational field is relatively weak at the Moon. - none of the above
conservation of energy.
The first law of thermodynamics is a restatement of the - conservation of energy. - Carnot cycle. - principle of entropy. - law of heat addition. - none of these
one at Earth's center and the other elsewhere
The foci of the elliptical path for an Earth satellite are _______. - both outside Earth - one at Earth's center and the other elsewhere - one atop the other at Earth's center - both inside Earth
greater the efficiency.
The greater the difference in temperature between the input reservoir and the output reservoir for a heat engine, the - less the efficiency. - greater the efficiency. - Neither - efficiency of a heat engine doesn't depend on temperature difference.
catenary
The name given to the shape of a sagging rope supported at its ends is a __________. - hyperbola - catenary - parabola - semi-circle
higher than for a larger bell
The natural frequency of a small bell is _______. - lower than for a larger bell - the same as for all other sizes of bells - higher than for a larger bell - mainly dependent on the temperature of the bell
conservation of energy
The operation of a hydraulic press best illustrates _______. - Archimedes' principle - conservation of energy - streamline flow of fluids - differences in pressure
atoms
The periodic table of the elements is a list of __________. - isotopes - atoms - ions - molecules
interference
The phenomenon of beats is most closely related to _______. - interference - forced vibration - radio broadcasts - resonance
interference.
The phenomenon of beats results from sound - refraction. - interference. - reflection. - all of these - none of these
frequency
The pitch of sound is most closely related to _______. - its speed - wavelength - amplitude - frequency
downward force on the block
The pressure increases on a block resting on a table when you increase the _______. - surface area - density of the block - downward force and surface area - downward force on the block
perpendicular to the wave
The vibrations along a transverse wave move in a direction _______. - perpendicular to the wave - along the wave - both along with and perpendicular to the wave - neither along with nor perpendicular to the wave
movement of heat
The word thermodynamics stems from a Greek expression for _______. - thermal limits to temperature - movement of heat - thermal mechanics - microscopic considerations of thermal properties
electrons
Thermal conduction mostly involves the motion of _______. - neutrons - atoms - air molecules - electrons
fluids
Thermal convection applies mainly to _______. - insulators. - conductors - radiant energy - fluids
transfer some of their kinetic energy to us.
We are warmed by condensation because water molecules in the air that strike our bodies - transfer some of their kinetic energy to us. - gain kinetic energy as they change state. - form an insulating layer on our bodies.
intensity
What feature of sound is measured in decibels? View Available Hint(s) - intensity - loudness - either intensity or loudness - neither intensity nor loudness
The frequency increases.
What happens to the frequency of the wave if you increase the wave velocity, keeping the wavelength of the wave constant? - The frequency increases. - The frequency decreases. - The frequency neither increases nor decreases.
The frequency decreases.
What happens to the frequency of the wave if you increase the wavelength, keeping the velocity of the wave constant? - The frequency stays the same. - The frequency increases. - The frequency decreases.
greenhouse gases
What type of gas absorbs and re-emits infrared radiation? - neither the greenhouse gases nor the non-greenhouse gases - greenhouse gases - non-greenhouse gases
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.
compression
When a load is placed on the middle of a horizontal beam supported at each end, the top part of the beam undergoes - compression. - tension. - either of these - none of these
Hydrogen
Which of the following is an element? - H2O - Carbon dioxide - A supernova - Hydrogen
An ant
Which of the following is stronger per bodyweight? - A human - A fish - An elephant - An ant
Water vapor
Which of the following most prevents the escape of terrestrial radiation? - Carbon monoxide - Water vapor - Carbon dioxide - Air
iron
Which of the following normally warms up fastest when heat is applied? - wood - iron - glass - water - All of the above choices are equally true.
intensity of sound
Which of these can be most accurately measured? View Available Hint(s) - loudness of sound - intensity of sound - either intensity or loudness of sound - neither intensity nor loudness of sound
