quiz3Ac

# quiz3Ac - Physics 1A 10 AM class Quiz 3 Nov 16 2007 Prof...

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Physics 1A- 10 AM class Quiz # 3 Nov. 16, 2007 Prof. Jose Onuchic MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Figure 1 1) In Figure 1, two wooden blocks of 0.30 kg mass each are connected by a string which passes over a pulley. One block slides on a horizontal table, while the other hangs suspended by the string, as shown in the sketch. At t = 0, the suspended block is 0.80 m over the floor, and the blocks are released from rest. After 2.5 s, the suspended block reaches the floor. What is the coefficient of kinetic friction between the table and the sliding block? A) 0.52 B) 0.65 C) 0.35 D) 0.95 E) 0.84 Figure 2 A 2.5 kg, sliding on a rough surface, has a speed of 1.2 m/s when it makes contact with a spring. The block comes to a momentary halt when the compression of the spring is 5.0 cm. The work done by the friction, from the instant the block makes contact with the spring until is comes to a momentary halt, is -0.50 J.

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