# Modeltest3 - PHY 2011 : Fall 2007 Model Midterm Exam 3...

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PHY 2011 : Fall 2007 Model Midterm Exam 3 TOTAL POINTS=50 Time: 50 minutes Name (Please print) : INSTRUCTIONS : Show all your work for the work-out (non-multiple choice) problems so that the grader can clearly follow your line of thought and calculations! Showing work for multiple choice problems is not necessary. Use the reverse sides if necessary. DEFINITELY CIRCLE THE FINAL ANSWERS! (Formulas on last pages) Your final score : ( )/50 1

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Questions 1 to 10: 2 points each! 1. On an object sliding down a frictionless, stationary surface, the normal force exerted by the surface (a) always does zero work. (b) always does positive work. (c) always does negative work. (d) can do positive, zero, or negative work depending on the situation 2. Friction is a (a) conservative force. (b) non-conservative force. (c) a fictitious force. (d) neither of the above. 3. If a spring is extended by 0.1 meter from its relaxed length, then its potential energy is 5J. Its potential energy when it is compressed by 0.2 meter is (a) -10J. (b) 10J. (c) -20J. (d) 20J. 4. The center of mass of the sun and Earth is (a) equidistant from them. (b)
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## This test prep was uploaded on 04/17/2008 for the course PHYS 2011 taught by Professor Sde during the Spring '08 term at University of Minnesota Duluth.

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Modeltest3 - PHY 2011 : Fall 2007 Model Midterm Exam 3...

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