Exam2_review_soln

Exam2_review_soln - 1. A book is sitting on the very slick...

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1. A book is sitting on the very slick (frictionless) passenger seat of a car. The car is moving at a constant velocity. The driver suddenly hits his breaks. The book suddenly slides off the seat. Why? (a) A force acted on the book in the forward direction. (b) A force acted on the book in the backward direction. (c) A force acted on the car and the book in the forward direction. (d) A force acted on the car and the book in the backward direction. (e) No force acted on the book, so it continued to move at the same original velocity while the car slowed down. 4. A sled is being pulled across a horizontal surface at a constant velocity . The pulling force is given by F A and is directed at an angle above the horizontal. What is the correct free-body diagram for the sled? Read the force labels carefully! (a) F N F A f s W F N F A f k W F N F A f k W (b) (c) F N F A W f s (d) F N F A f k W (e) 2. A ball moves with a constant speed of 4 m/s around a circle of radius 0.25 m. What is the period of the rotation? (a) 0.1 s (b) 0.4 s (c) 0.7 s (d) 8 s (e) 2 s 3. An object is lifted vertically 6 meters and then returned to its original position. What was the work done on the object by gravity during the round trip if the object weighs 20 N? a) No work is done on the object b) 60 J c) 120 J d) 240 J e) -120 J
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5. Two objects (3 kg and 9 kg) are released simultaneously on a frictionless inclined plane that makes an angle of 35 o with the horizontal. What can we say about their accelerations
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Exam2_review_soln - 1. A book is sitting on the very slick...

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