2003FPre2 - Section YOUR NAME Section Instructor’s Name...

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Section #: ________ YOUR NAME: ___________________________ Section Instructor’s Name: ___________________________ Physics 207 Prelim 2 Exam November 11, 2003 7:30-9:00 p.m.  PLEASE CHECK THAT THIS PACKAGE HAS 11 PROBLEMS ON 11 PAGES! Three blank pages to be used as scrap paper should be attached at the end of this package. Two formula and value sheets have been handed out separately. Write your answers directly on the question sheets in the spaces provided. Multiple-choice problems will be graded based on the answer only; work need not be shown. For the other problems, show enough of your work to indicate how you arrived at your result. Clearly label your work and your answers. For numeric answers be sure to give the appropriate units. If you need more space for calculations, use the backs of the question sheets and clearly label the whereabouts of your work for each problem. Work on separate scrap paper will not be graded. Do not spend too much time on any one problem or part of a problem. Solve the problems that you can solve easily first, and then return to the more difficult problems. It’s a good use of your time to read the entire exam before starting. This is a closed book exam. You may use non-graphing calculators.  For grading use only: 1. _____________ / 10 6. _____________ / 5 11. _____________ / 12 2. _____________ / 15 7. _____________ / 5 3. _____________ / 10 8. _____________ / 8 4. _____________ / 13 9. _____________ / 6 5. _____________ / 8 10. _____________ / 8 Total: _____________ / 100
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1. [10 points] A block of mass m is pushed a distance up a surface inclined at an angle d θ with respect to the horizontal at constant speed by a horizontal force F r (see figure). There is friction between the block and surface. Please express your answers to the following in terms of one or more of m , F , d , , g (magnitude of acceleration due to gravity), and pure numbers (like 2, 0.5, π , etc.) only . m F r d (a) What is the work done by the force F r ? . __________ __________ __________ = F W r (b) What is the change in thermal energy of the block and surface due to this motion? . __________ __________ E 1
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2003FPre2 - Section YOUR NAME Section Instructor’s Name...

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