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practice2_2007

# practice2_2007 - Physics 6A 2nd Midterm Summer 2006...

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Physics 6A – 2 nd Midterm Summer 2006 SOLUTIONS Dr. Nassar (50-minute exam --- One 3 x 5 card is allowed) NAME:_________________________ Multiple-choice questions: (2.0 points each) M1. ___An object is attached to a spring and oscillates with amplitude A and period T, as represented on the graph above. The nature of the velocity v and acceleration a of the object at time 3T/4 is best represented by which of the following? (a) v > 0, a > 0 (b) v > 0, a < 0 (c) v > 0, a = 0 (d) v = 0, a < 0 (e) v = 0, a > 0 M2. ___ A block of weight W is pulled along a horizontal surface at constant speed v by a force F, which acts at an angle of θ with the horizontal, as shown above. The normal force exerted on the block by the surface has magnitude (a) W F cos θ (b) W – F sin θ (c) W (d) W + F sin θ (e) W + F cos θ M3. ___ A 0.20 kg object moves along a straight line. The net force acting on the object varies with the object’s displacement as shown in the graph above. The object starts from rest at displacement x = 0 and time t = 0 and is displaced a distance of 20 m. What is the amount of work done by the net force in displacing the object the first 20 m?

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practice2_2007 - Physics 6A 2nd Midterm Summer 2006...

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