MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

Transcription

1 Sample Mid-Term 2 Name MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) 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 A) sand. B) styrofoam. C) same 2) If the polar icecaps melted, the resulting water would spread over the entire earth. This new mass distribution would tend to make the length of a day A) longer. B) stay the same. C) shorter. D) longer at first, then shorter. E) shorter at first, then longer. 3) When a twirling ice skater brings her arms inward, her rotational speed A) decreases. B) remains the same. C) increases. 4) Consider a bowling alley inside a rotating space torus (huge "donut"). Compared to your bowling experience on earth, you will notice that the ball A) feels heavier when you throw it in the direction of the moving alley, and lighter when you throw it in the opposite direction. B) feels lighter when you throw it in the direction of the moving alley, and heavier when you throw it in the opposite direction. C) veers to the right when you throw it in the direction of the moving alley, and to the left when you throw it in the opposite direction. D) none of these 1) 2) 3) 4) 5) A swimming area in a rotating space habitat is located in a 1 4 g region. If a diver can jump 1 m high 5) in a 1 g region, how high can the same diver jump in the swimming area? A) 4 m B) 16 m C) 1 m D) 2 m E) more than 16 m 6) The faster a fluid moves, the A) less its internal pressure. B) greater its internal pressure. C) internal pressure is unaffected. 6) 1

2 7) Two vertical tubes of equal cross-sectional areas are filled with water and mercury. If water is filled to a depth of 10.3 m and mercury to a depth of 0.76 m, both liquids have equal A) densities. B) viscosity. C) weights. D) volumes. 8) Which of the following is an example of matter in a plasma state? A) dry ice B) liquid hydrogen C) a torch flame D) molten lava 9) There is a legend of a Dutch boy who bravely held back the Atlantic Ocean by plugging a leak near the top of a dike with his finger until help arrived. Which of the following is most likely? A) The huge size of the Atlantic Ocean makes this impossible. B) Although the force on his finger would have been huge, the pressure would have been small enough for this to occur. C) Both the force and pressure on his finger would have been great, but not too great for a public-spirited Dutch lad. D) The force on his finger would have been less than 1 N. 10) A car travels in a circle with constant speed. The net force on the car is A) zero because the car is not accelerating. B) directed towards the center of the curve. C) directed forward, in the direction of travel. D) none of these 11) A ball rolls down a hill mainly because of A) its rotational inertia. B) its angular momentum. C) an unbalanced torque. D) its angular acceleration. E) a balanced torque. 12) Airplane flight best illustrates A) Pascal's principle. B) Bernoulli's principle. C) Archimedes' principle. D) Boyle's law. 7) 8) 9) 10) 11) 12) 2

3 13) 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 A) styrofoam. B) sand. C) same on each as long as their volumes are the same 14) The buoyant force on an object is least when the object is A) submerged near the surface. B) partly submerged. C) submerged near the bottom. D) none of these 15) Compared to an empty ship, the same ship loaded with styrofoam will float A) higher in the water. B) at the same level in the water. C) lower in the water. 16) To turn a stubborn screw, it is best to use a screwdriver that has a A) smooth handle. B) wide handle. C) long handle. D) none of these 17) A space habitat is designed so that the variation in g between a person's head and feet is less than 0.01 g. If the person is 2 m tall, then the minimum radius of the habitat is A) 200 m. B) 2000 m. C) 20 m. D) more than 2000 m. 18) A floating ice cube contains small pieces of iron. During melting the water level will A) fall. B) rise. C) remain unchanged. 19) The flight of a blimp best illustrates A) Boyle's law. B) the principle of Archimedes. C) Pascal's principle. D) Bernoulli's principle. 20) Buoyant force is greatest on a submerged A) 1-kg block of aluminum. B) 1-kg block of lead. C) is the same on each 21) The chef at the infamous Fattening Tower of Pizza tosses a spinning disk of uncooked pizza dough into the air. The disk's diameter increases during the flight, while its rotational speed A) remains constant. B) decreases. C) increases. 22) A boat loaded with scrap iron floats in a swimming pool. When the iron is thrown overboard, the pool level will A) fall. B) rise. C) remain unchanged. 23) What is the simulated gravitational field strength half-way between the axis of the earth and the outside edge where the field strength is g? A) g B) one-half g C) zero D) three-quarters g 13) 14) 15) 16) 17) 18) 19) 20) 21) 22) 23) 3

4 24) The gravitational field best suited for humans living in an outer space colony is A) zero. B) g. C) one-quarter g. D) three-quarters g. E) one-half g. 25) Consider a rotating donut-shaped space habitat where living quarters are on the inside surface farthest from the axis. If the rotational speed of the habitat increases, the apparent weight of people inside A) stays the same. B) increases. C) is always zero. D) decreases. 26) The famous Leaning Tower of Pisa doesn't topple over because its center of gravity is A) above a place of support. B) displaced from its center. C) in the same place as its center of mass. D) relatively low for such a tall building. E) stabilized by its structure. 27) A phonograph record player has constant rotational speed. The speed of the record surface relative to the pickup needle is greatest A) at the end of the record. B) at the beginning of the record. C) everywhere, because it has the same speed anywhere on the record. 28) Which will roll down an incline in the shortest time, a can filled with water or the same can filled with ice? A) ice B) water C) both the same D) Not enough information is given. 29) A column that extends from sea level to the top of the atmosphere contains a certain mass of air. If the same column instead had the same mass of mercury in it, the height of the mercury column would be A) 10.3 meters. B) about 5.6 kilometers. C) about 3/4 meter. D) 1/13.6 times the height of the atmosphere. 30) 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 A) equal to your weight. B) greater than your weight. 24) 25) 26) 27) 28) 29) 30) 4

5 31) The long, heavy tail of a spider monkey enables the monkey to easily vary its A) momentum. B) weight. C) inertia. D) center of gravity. 31) Figure 8-A 32) An upright broom is easier to balance when the heavier end is A) highest, farthest from your hand. B) nearest your hand. C) same either way. 33) A boy plays solitary seesaw by placing a long plank over a small rock and sitting at one end of the plank. When the seesaw is balanced, the boy's mass is A) less than the mass of the seesaw. B) equal or very nearly equal to the mass of the seesaw. C) greater than the mass of the seesaw. D) Not enough information is given. 34) Alcohol is less dense than water. If alcohol is used to make a barometer on a day when atmospheric pressure is normal, the height of the alcohol column would be A) more than 10.3 m. B) 10.3 m. C) less than 10.3 m. 35) To kick a football so it won't topple end over end, kick it so the force of impact extends A) through its center of gravity. B) above its center of gravity. C) below its center of gravity. 36) The buoyant force on a rock is least when the rock is submerged A) near the surface. B) near the bottom. C) halfway to the bottom. D) all of the above 32) 33) 34) 35) 36) 5

6 37) A column that extends from sea level to the top of the atmosphere contains a certain mass of air. If the same column instead had the same mass of water in it, the height of the water column would be A) 10.3 meters. B) about 5.6 kilometers. C) 1/13.6 times the height of the atmosphere. D) about 3/4 meter. 38) Blood pressure is normally greater in your A) ears. B) feet. C) same in each 39) A row boat containing a barrel of water floats in a swimming pool. When the water in the barrel is poured overboard, the swimming pool level will A) rise. B) fall. C) remain unchanged. 40) When doing somersaults, you'll more easily rotate when your body is A) straight with both arms at your sides. B) straight with both arms above your head. C) balled up. D) no difference 41) In a vacuum, an object has no A) temperature. B) mass. C) buoyant force. D) weight. E) all of these 42) A block of wood weighing 5 N in air, is difficult fully submerge in a pool of mercury because the buoyant force when fully submerged is A) 5 N. B) more than 5 N. C) less than 5 N. 43) Three icebergs are each floating in bathtubs filled to the brim with water. Iceberg A has large air bubbles in it. Iceberg B has unfrozen water in it. Iceberg C has an iron railroad spike in it. When the ice melts, what happens? A) The water level in C will decrease while the other two water levels will remain the same. B) The water level in A will stay the same, while the other tubs will spill over. C) Only the water in C will spill over. D) All the tubs spill over. E) All stay exactly the same. 44) 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) more than four times as high as in the larger tube. C) twice as high as mercury in the larger tube. D) four times as high as mercury in the larger tube. 37) 38) 39) 40) 41) 42) 43) 44) 6

7 45) You know that you can safely stand on the overhanging end of a heavy plank that rests on a table. How far out depends on your mass and the mass of the plank. Suppose you can stand on the end of 45) a plank that overhangs the edge of the supporting table 1 4 its total length. Then how massive is the plank compared to your mass? A) the same as your mass B) 4 times your mass C) twice your mass D) 1 1 your mass 2 E) 1 2 your mass 46) Suppose you're on a Ferris wheel at a carnival, seated 10 m from the Ferris wheel's axis. If you make a complete rotation each minute, your linear speed is A) 62.8 m/min. B) 10 m/min. C) 31.4 m/min. D) 100 m/min. E) Not enough information is given. 47) Which moves faster in m/s on a merry-go-round: a horse on the inside or a horse on the outside near the outer rail? A) inside horse B) outside horse C) Both move at the same speed in m/s. 48) Your pet hamster sits on a record player whose angular speed is constant. If he moves to a point twice as far from the center, then his linear speed A) doubles. B) remains the same. C) halves. 49) Lobsters live on the bottom of the ocean. The density of a lobster is A) greater than the density of sea water. B) less than the density of sea water. C) equal to the density of sea water. 50) 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) salt sinks to the bottom. B) calcium in the egg shell is repelled by sodium chloride. C) the density of salt water exceeds the density of egg. D) buoyant force does not always act upward. 46) 47) 48) 49) 50) 7

8 Answer Key Testname: SAMPLE_MT2 1) A 2) A 3) C 4) A 5) A 6) A 7) C 8) C 9) D 10) B 11) C 12) B 13) C 14) B 15) C 16) B 17) A 18) A 19) B 20) A 21) B 22) A 23) B 24) B 25) B 26) A 27) B 28) B 29) C 30) A 31) D 32) A 33) C 34) A 35) A 36) D 37) A 38) B 39) C 40) C 41) C 42) B 43) A 44) A 45) A 46) A 47) B 48) A 49) A 50) C 8