Final2006solutions

# Final2006solutions - SOLUTIONS Physics 6A Summer 2006 Print Name Final Exam(3-hour exam Two 3x5 cards allowed Dr Nassar MULTIPLE-CHOICE QUESTIONS(2

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SOLUTIONS Physics 6A - Summer 2006 Print Name: _____________________ Final Exam (3-hour exam --- Two 3x5 cards allowed) Dr. Nassar MULTIPLE-CHOICE QUESTIONS: (2 points each) Choose the best answer. M1. ___A push broom of mass m is pushed across a rough horizontal floor by a force of magnitude T directed at an angle θ , as shown below. The coefficient of friction between the broom and the floor is μ . The frictional force on the broom has magnitude (a) (mg Tsin ) μ+ θ (b) μ− θ (c) (mg Tcos ) θ (d) θ (e) mg μ M2. ___ The graph below shows the velocity versus time for an object moving in a straight line. At what time after time = 0 does the object again pass through its initial position? (a) Between 0 and 1 s (b) 1 s (c) Between 1 and 2 s (d) 2 s (e) Between 2 and 3 s M3. A tennis ball of mass m rebounds from a racquet with the same speed v as it had initially, as shown above. The magnitude of the momentum change of the ball is (a) 2mv sin θ (b) 2mv cos θ (c) 2mv (d) mv (e) 0

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M4. ___A block oscillates without friction on the end of a spring as shown above. The minimum and maximum lengths of the spring as it oscillates are x min and x max , respectively. The graphs below represent quantities associated with the oscillation as functions of the length x of the spring. Which graph can represent the total mechanical energy of the block-spring system as a function of x? 5. ___ An automobile moves at constant speed down a hill along the smoothly curved M surface shown below.
Which of the following diagrams best represents the directions of the velocity and acceleration of the automobile at the instant that it is at the lowest position, as shown?

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## This note was uploaded on 05/28/2008 for the course PHYS 6A taught by Professor Mahaashour-abdalla during the Summer '07 term at UCLA.

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Final2006solutions - SOLUTIONS Physics 6A Summer 2006 Print Name Final Exam(3-hour exam Two 3x5 cards allowed Dr Nassar MULTIPLE-CHOICE QUESTIONS(2

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