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LSU PHYS 2001 Exam 3 Concept Questions and answers
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LSU PHYS 2001 Exam 3 Concept Questions and answers
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LSU PHYS 2001 Exam 3 Concept Questions and answers A high -jumper, having just cleared the bar, lands on an air mattress and comes to rest. Had she landed directly on the hard ground, her stopping time would have been much shorter. Using the impulse -momentum theorem as your guide, determine which one of the following statements is correct. A. The air mattress exerts a greater impulse, and a greater net average force, on the high -jumper than does the hard ground. B. The air mattress exerts a greater impulse, but a smaller net average force, on the high -jumper than does the hard ground C. The air mattress exerts a smaller impulse, and a smaller net average force, on the high -jumper than does the hard ground. D. The air mattres s exerts the same impulse, but a smaller net average force, on the high -jumper than does the hard ground. E. The air mattress exerts the same impulse, but a greater net average force, on the high -jumper than does the hard ground. - D. The air mattress exer ts the same impulse, but a smaller net average force, on the high -jumper than does the hard ground. Which of the following statements is necessarily true for an object in static equilibrium? A. The net torque on the object is zero B. The net force on the object is zero C. Both A and B D. The frictional forces cancel each other out E. The object is moving in a straight line - C. Both A and B A nonzero net force acts on a particle and does work. This is the only force acting on the particle. Which one of th e following statements is true? A) The kinetic energy of the particle changes, but the velocity of the particle does not change. B) The kinetic energy, speed, and velocity of the particle change. C) The kinetic energy of the particle changes, but the speed of the particle does not change. D) The kinetic energy of the particle does not change, but the speed of the particle does change. E) The kinetic energy and the speed of the particle change, but the velocity of the particle does not change. - B) The kinetic energy, speed, and velocity of the particle change. You are moving out of town and need to load a heavy box of mass m off of the ground and into the back of the moving truck. You can either pi ck the box straight up and set it in the truck (a height h above the ground) or slide the box a distance L up a ramp into the back of the truck. Assume the ramp has good rollers on it, so that it is frictionless. Which way of loading the box requires more work? A) Lifting the box straight up off the ground requires more work. B) Sliding the box up the roller -ramp requires more work. C) Lifting the box straight up and sliding the box up the ramp require the same amount of work. D) It could be either... but you must know the mass m of the box to answer this question. E) It could be either... but you must know the lengths L and h to answer this question. - C) Lifting the box straight up and sliding the box up the ramp require the same amount of work. A beagle sits on the left end of a stationary raft in still water. The beagle gets up, walks to the other end of the raft, and sits back down. The beagle and the raft have the same mass. Which of the following statements is true? (You should neglect any drag effec ts due to the water.)The benefits of buying summaries with Stuvia:
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