Physics 130 Practice Questions- Ch. 14 – Flashcards

3) Atmospheric molecules do not fly off into outer space because of A) their relatively high speeds. B) their relatively low densities. C) Earth gravitation. D) cohesive forces.

4) About what percentage of the molecules that make up the atmosphere are below an aircraft that flies at an altitude of 6 kilometers? A) 20% B) 30% C) 40% D) 50% E) more than 50%

5) Atmospheric pressure is caused by the A) density of the atmosphere. B) weight of the atmosphere. C) temperature of the atmosphere. D) effect of the sun's energy on the atmosphere.

6) What is the approximate mass of a 1-squarecentimeter column of air that extends from sea level to the top of the atmosphere? A) 1 gram B) 1 kilogram C) 10 kilograms D) 100 kilograms

9) As a helium-filled balloon rises in the air, it becomes A) bigger. B) more dense. C) heavier. D) all of these E) none of these

11) A one-ton blimp hovers in the air. The buoyant force acting on it is A) zero. B) one ton. C) less than one ton. D) more than one ton.

13) 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 these

16) About how high can water be theoretically lifted by a vacuum pump at sea level? A) less than 10.3 m B) more than 10.3 m C) 10.3 m

17) The flight of a blimp best illustrates A) the principle of Archimedes. B) Pascal's principle. C) Bernoulli's principle. D) Boyle's law.

18) Airplane flight best illustrates A) Archimedes' principle. B) Pascal's principle. C) Bernoulli's principle. D) Boyle's law.

19) The faster a fluid moves, the A) greater its internal pressure. B) less its internal pressure. C) internal pressure is unaffected.

26) Consider two mercury barometers, one with twice the cross-sectional area of the other. Neglecting capillarity, mercury in the smaller tube will rise A) the same height as in the larger tube. B) twice as high as mercury in the larger tube. C) four times as high as mercury in the larger tube. D) more than four times as high as in the larger tube. E) none of these

30) 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 of the balloon equals atmospheric pressure on the top of the balloon. C) the balloon and surrounding air have equal densities. D) all of these E) none of these

33) Compared to 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.

38) The depth to which an inverted drinking glass must be pushed beneath the surface of water so that the volume of enclosed air is squeezed to half is A) 76 cm. B) 10.3 m. C) 14.7 m. D) 20.6 m. E) 29.4 m.

44) In a vacuum, an object has no A) buoyant force. B) mass. C) weight. D) temperature. E) all of these

50) A large block of wood and a smaller block of iron on weighing scales both register the same weight - 1 ton. Taking buoyancy of air into account, which has the greater mass? A) wood B) iron C) Both have the same mass. D) More information is needed.