quiz3Ab1 (1)

# quiz3Ab1 (1) - Physics 1A 9 AM class Quiz 3 Nov 7 2008 Prof...

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Physics 1A- 9 AM class Quiz # 3 Nov. 7, 2008 Prof. Jose Onuchic MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Figure 1 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. 1) In Figure 1, the force constant of the spring is closest to: A) 940 N/m B) 840 N/m C) 890 N/m D) 1040 N/m E) 990 N/m 2) In Figure 1, after compressing the spring, the block moves away from it. The speed of the block, upon separation from the spring, is closest to: 3) A worker pushes a sled with a force of 40 N over a level distance of 6.0 m. If a frictional force of 24 N acts on the wheelbarrow in a direction opposite to that of the worker, what net work is done on the wheelbarrow?

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