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Unformatted text preview: More than 30 J B. Less than 30 J C. Exactly 30 J D. Cannot be determined. E. Not covered in the assigned reading. If you push twice as hard against a stationary brick wall, the amount of work you do on the wall A. doubles B. is cut in half C. remains constant but non-zero D.* remains constant at zero. E. Not covered in the assigned reading. A child pushes horizontally on a box of mass m that moves with constant speed v across a horizontal floor. The coefficient of friction between the box and the floor . is At what rate does the child do work on the box? A.* B. C. D. E. 2. 3. 4. 5. 6. 7. Two objects collide and stick together. Kinetic energy A. is definitely conserved. B. is conserved only when momentum is conserved. C. is conserved only if the collision is elastic. D. is conserved only if the environment is frictionless. E.* Not covered in the assigned reading. Which of the following energy forms is associated with an object due to its position relative to Earth? A. potential energy B.* gravitational potential energy C. elastic potential energy D. kinetic energy E. Not covered in the assigned reading. Which of the following energy forms is stored in any compressed or stretched object? A. potential energy B. gravitational potential energy C.* elastic potential energy D. kinetic energy E. Not covered...
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This note was uploaded on 08/29/2010 for the course PHYS 38234 taught by Professor Ramesh during the Spring '09 term at University of California, Berkeley.

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