(2 pts.) What is necessary rotational equalbrum condition b) F for c) 0 d) 5. (2

Question

(2 pts.) What is necessary rotational equalbrum condition b) F for c) 0 d) 5. (2 pts.) You throw a ball straight up. Compare the sign of the work done by gravity while the ban goes up with the sign of the work done by gravity while the ball goes down. a) Work up is negative and work down is negative. b) Work up is positive and work down is positive. c) work up is negative and work down d) Work up is positive and work down is negative. (2 pts.) A 40.0 kg block slides down a rough incline plane. The coefficient of winetic friction between the block and the surface is 0.1. which diagram represents best the free-body diagram of the block? (b) (c) 7. (2 pts.) Two cars suffer a head-on collision. What is conserved in the collision? a) Mechanical energy and momentum. b) Kinetic energy c) Momentum d) Neither energy nor momentum is conserved

Explanation / Answer

4-c

5-b

6-b

7-c

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