Question

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Answer the following questions on the Scantron form. Each multiple choice question it worth 2 5 points. Be sure to Indicate test version the scontron form! A 2 5-kg stone is released from rest and falls toward Earth. After 4 0 s, the magnitude of its momentum is: 39kg middot m/s 98 kg middot s 0 kg middot s 78kg middot s 24 kg middot m/s If the total momentum of a system is changing: a net external force must be acting on the system the center of mass must have constant velocity particles of the system must be exerting forces on each other the system must be under the influence of gravity none of the above The physical quantity "impulse" has the same dimensions as that of: power energy work force momentum A 0.3 kg rubber ball is dropped from the window of a building. It strikes the sidewalk below at 30 m/s and rebounds up at 20 m/s. The magnitude of the impulse due to the collision with the sidewalk is: 6.0N middot s 29 N middot s 15 N middot s 3.0 N middot s 9.0 N middot s A student's life was saved in an automobile accident because an airbag expanded in front of his head. If the car had not been equipped with an airbag, the windshield would have stopped the motion of his head in a much shorter time. Compared to the windshield, the airbag: exerts a much smaller impulse exerts a much smaller force causes a much smaller change in momentum does much more work causes a much smaller change in kinetic energy A 64kg woman stands on frictionless level ice with a 0.10-kg stone at her feet. She kicks the stone with her foot so that she acquires a velocity of 0.0017 m/s in the forward direction. The velocity acquired by the stone is: 0.0017 m/s backward 1.1 m/s backward 0.0017 m/s forward none of these 1.1 m/s forward

Answer 1

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