# Physics Chapter 14

Flashcard maker : Lily Taylor
1) The energy source responsible for molecular motions in Earth’s atmosphere is
A) their own natural kinetic energy.
B) pressure caused by the weight of air.
C) atmospheric tides.
D) the Sun.
D) the Sun.
2) Atmospheric molecules do not fly off into outer space due to
A) their chaotic speeds.
B) their relatively low densities.
C) Earth gravitation.
D) cohesive forces.
C) Earth gravitation.
3) Compared to the ocean, Earth’s atmosphere is different in that
A) its density varies with depth.
B) it has a less-distinct surface.
C) molecules are more greatly spaced.
D) all of the above
E) none of the above
D) all of the above
4) About what percentage of molecules in the air make up the atmosphere below a 6-kilometer altitude?
A) 20%
B) 30%
C) 40%
D) 50%
E) more than 50%
E) more than 50%
5) The air in your classroom has
A) mass.
B) weight.
C) energy.
D) all of the above
E) none of the above
D) all of the above
6) Atmospheric pressure is caused by the
A) density of the atmosphere.
B) weight of the atmosphere.
C) temperature of the atmosphere.
D) solar energy on the atmosphere.
B) weight of the atmosphere.
7) In drinking soda or water through a straw, we make use of
A) capillary action.
B) surface tension.
C) atmospheric pressure.
D) Bernoulli’s principle.
E) none of the above
C) atmospheric pressure.
8) At normal atmospheric pressure and temperature, 1 cubic meter of air has a mass of about
A) 1.00 kg.
B) 1.25 kg.
C) 2.00 kg.
D) 2.25 kg.
B) 1.25 kg.
9) When a suction cup sticks to a wall it is
A) pulled to the wall by the vacuum.
B) pushed to the wall by the atmosphere.
C) both of these
D) neither of these
B) pushed to the wall by the atmosphere.
10) Approximately how much air is in a column 1-cm2 in cross section that extends from sea level to the top of the atmosphere?
A) 1 gram
B) 1 kg
C) 10 kg
D) 100 kg
B) 1 kg
11) What approximate weight of air is in a column 1-cm2 in cross section that extends from sea level to the top of the atmosphere?
A) 0.01 N
B) 10 N
C) 100 N
D) 1000 N
B) 10 N
12) The weight of air in a column 1-m2 in cross section that extends from sea level to the top of the atmosphere is
A) 101 N.
B) 10,100 N.
C) 101,000 N.
D) 101,000,000 N.
C) 101,000 N.
13) About how high can water at sea level be theoretically lifted by a vacuum pump?
A) less than 10.3 m
B) 10.3 m
C) more than 10.3 m
B) 10.3 m
14) A column that extends from sea level to the top of the atmosphere contains a certain mass of air. If the column instead contained the same mass of mercury, its height would be about
A) 3/4 meter.
B) 10.3 meters.
C) 5.6 kilometers.
D) none of the above
A) 3/4 meter.
15) A column that extends from sea level to the top of the atmosphere contains a certain mass of air. If the column instead contained the same mass of water, its height would be about
A) 3/4 meter.
B) 10.3 meters.
C) 5.6 kilometers.
D) none of the above
B) 10.3 meters.
16) Consider two mercury barometers, one with twice the cross-sectional area of the other. Neglecting capillarity, compared with the wider tube, mercury in the smaller tube will rise
A) to the same height.
B) twice as high.
C) four times as high.
D) more than four times as high.
E) none of the above
A) to the same height.
17) Two vertical tubes of equal cross-sectional areas are filled with liquids to heights producing atmospheric pressure at their bottoms. One liquid is water and the other is mercury. Both liquids have equal
A) volumes.
B) densities.
C) weights.
D) viscosity.
E) none of the above
C) weights.
18) Alcohol is less dense than water. If alcohol is used to make a barometer at normal atmospheric pressure, the height of the alcohol column would be
A) less than 10.3 m.
B) 10.3 m.
C) more than 10.3 m.
C) more than 10.3 m.
19) Marshmallows in a vacuum become
A) larger.
B) smaller.
C) flat.
D) a hollow shell.
E) none of the above
A) larger.
20) It would be easier to pull the evacuated Magdeburg hemispheres apart if they were
A) held upside down.
B) at sea level.
C) 20 km beneath the ocean surface.
D) 20 km above the ocean surface.
E) none of the above
B) at sea level.
21) If one of the pair of Magdeburg hemispheres were fastened to a strong tree, the force needed by a single party to pull them apart would be
A) half as much.
B) the same.
C) twice as much.
D) none of the above
B) the same.
22) The mass of air inside an average mid-size automobile is about
A) 0.2 kg.
B) 2 kg.
C) 20 kg.
D) 200 kg.
E) 2000 kg.
B) 2 kg.
23) The weight of air in a bathtub (about 1/3 cubic meter) is about the same as the weight of
A) a pea.
B) an egg.
C) a small apple.
D) a pound of butter.
E) a 10-pound sack of potatoes.
D) a pound of butter.
24) When a gas in a container is squeezed to half its volume with no change in temperature, the gas pressure
A) halves.
B) doubles.
D) remains the same.
B) doubles.
25) When a gas in a container is squeezed to half its volume, its density
A) halves.
B) doubles.
D) remains the same.
B) doubles.
26) When a gas in a container expands to twice its volume, its density
A) halves.
B) doubles.
D) remains the same.
A) halves
27) When boarding an airplane you bring a bag of chips. While in flight the bag puffs up, because
A) air pressure in the air-tight bag is greater than cabin air pressure.
B) suction is occurring.
C) air pressure is affected by the Bernoulli principle.
D) all the above
E) none of the above
A) air pressure in the air-tight bag is greater than cabin air pressure.
28) A bubble of air released from the bottom of a lake
A) rises to the top at constant volume.
B) becomes smaller as it rises.
C) becomes larger as it rises.
D) alternately expands and contracts as it rises.
E) none of the above
C) becomes larger as it rises.
29) While Debbie Diver holds her breath and swims deeper and deeper beneath the water’s surface, her density
A) increases.
B) decreases.
C) remains the same.
A) increases.
30) A scuba diver losing her air supply while far beneath the water surface is advised when ascending to
A) hold air in her lungs.
B) allow air to escape her lungs.
C) panic.
A) hold air in her lungs.
31) A swimmer cannot snorkel more than a meter deep because air
A) in the lungs cannot easily be expelled.
B) tends to liquefy in the snorkel tube.
C) is buoyed up leaving the swimmer breathless.
D) at the surface will not freely enter the higher-pressure region in the compressed lungs.
E) all of the above
D) at the surface will not freely enter the higher-pressure region in the compressed lungs.
32) The depth to which an inverted drinking glass must be pushed beneath the water surface to squeeze the enclosed air to half its volume is
A) 76 cm.
B) 10.3 m.
C) 14.7 m.
D) 20.6 m.
E) 29.4 m.
B) 10.3 m.
33) Archimedes’ principle applies to
A) liquids.
B) gases.
C) fluids.
D) all of the above
D) all of the above
35) The flight of a blimp best illustrates
A) Archimedes’ principle.
B) Pascal’s principle.
C) Bernoulli’s principle.
D) Boyle’s law.
A) Archimedes’ principle.
34) The buoyant force of the atmosphere on a body is equal to the
A) weight of air displaced.
B) volume of air displaced.
C) mass of the air displaced.
D) all of the above
E) none of the above
A) weight of air displaced.
36) The buoyant force on a one-ton blimp hovering in air is
A) zero.
B) one ton.
C) less than one ton.
D) more than one ton.
B) one ton.
37) Inside the same room, buoyant force is greater on
A) a helium-filled party balloon.
B) an elephant.
C) both the same
B) an elephant.
38) A buoyant force acts on
A) gas-filled balloons.
B) you and your classmates.
C) both of these
D) neither of these
C) both of these
39) Compared with air pressure on the outside, air pressure inside an inflated stretched balloon is
A) less.
B) equal.
C) greater.
C) greater.
40) As a high-altitude balloon sinks lower into the atmosphere, it undergoes a decrease in
A) volume.
B) density.
C) weight.
D) mass.
E) none of the above
A) volume.
41) As a high-altitude balloon rises higher into the atmosphere, it undergoes a decrease in
A) volume.
B) density.
C) weight.
D) mass.
E) none of the above
B) density.
42) As a balloon high in the atmosphere descends, it undergoes a decrease in
A) volume.
B) density.
C) weight.
D) mass.
E) none of the above
A) volume.
43) As a balloon rises higher and higher into the atmosphere its
A) volume decreases.
B) density increases.
C) weight increases.
D) mass decreases.
E) none of the above
E) none of the above
44) A common 5-liter metal can will float in air if it is
A) evacuated of air.
B) filled with a very large amount of helium.
C) thrown high enough.
D) no way, unless the displaced air weighs more than the can and its contents!
D) no way, unless the displaced air weighs more than the can and its contents!
45) An object in a vacuum has no
A) buoyant force.
B) mass.
C) weight.
D) temperature.
E) all of the above
A) buoyant force.
46) A helium-filled balloon released in the atmosphere will rise until
A) the pressure inside the balloon equals atmospheric pressure.
B) atmospheric pressure on the bottom and top of the balloon are equal.
C) the balloon and surrounding air have equal densities.
D) all of the above
E) none of the above
C) the balloon and surrounding air have equal densities.
47) Compared with the buoyant force of the atmosphere on a 1-liter helium-filled balloon, the buoyant force of the atmosphere on a nearby 1-liter solid iron block is
A) considerably less.
B) considerably more.
C) the same.
C) the same.
48) Compared to the buoyant force of the atmosphere on a 1-kilogram iron block, the buoyant force on a nearby 1-kilogram helium-filled balloon is
A) considerably less.
B) considerably more.
C) the same.
B) considerably more.
49) If you stand on a weighing scale and suddenly the atmosphere vanishes, taking buoyancy into account, the scale reading
A) increases.
B) decreases.
C) remains the same.
D) quickly reduces to zero.
A) increases.
50) Assuming no change in temperature, as a freely expanding helium-filled balloon rises in the atmosphere, the buoyant force acting on it
A) increases.
B) decreases.
C) remains nearly the same.
C) remains nearly the same.
51) A large block of wood and a smaller block of iron on weighing scales both register 1 ton. Taking buoyancy of air into account, which has the greater mass?
A) wood
B) iron
C) both have the same mass.
A) wood
52) Release a ball inside a freely falling elevator and it falls directly in front of you instead of “falling to the floor,” because you, ball, elevator, and enclosed air are in free fall. If you do the same with a helium-filled balloon, the balloon will
A) also remain in front of you.
B) press against the ceiling.
C) press against the floor.
D) slowly rise.
E) slowly fall.
A) also remain in front of you.
53) A car with closed windows makes a left hand turn. A helium-filled balloon in the car moves to the
A) right.
B) left.
C) front.
D) back.
E) none of the above
B) left.
54) An empty jar is pushed open-side downward into water so that trapped air cannot escape. As it is pushed deeper, the buoyant force on the jar
A) increases.
B) decreases.
C) increases, then decreases.
D) decreases, then increases.
E) remains the same.
B) decreases.
55) As a fluid gains speed, its internal pressure
A) increases.
B) remains unchanged.
C) decreases.
C) decreases.
56) Airplane flight best illustrates
A) Archimedes’ principle.
B) Pascal’s principle.
C) Bernoulli’s principle.
D) Boyle’s law.
C) Bernoulli’s principle.

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