2048_Spring09_Exam3 - 77777 Instructor(s...

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77777 77777 Instructor(s): Hirschfeld/Matcheva PHYSICS DEPARTMENT PHY 2048 Exam 3 April 13, 2009 Name (print, last first): Signature: On my honor, I have neither given nor received unauthorized aid on this examination. YOUR TEST NUMBER IS THE 5-DIGIT NUMBER AT THE TOP OF EACH PAGE. (1) Code your test number on your answer sheet (use lines 76–80 on the answer sheet for the 5-digit number) . Code your name on your answer sheet. DARKEN CIRCLES COMPLETELY . Code your UFID number on your answer sheet. (2) Print your name on this sheet and sign it also. (3) Do all scratch work anywhere on this exam that you like. Circle your answers on the test form. At the end of the test, this exam printout is to be turned in. No credit will be given without both answer sheet and printout. (4) Blacken the circle of your intended answer completely, using a #2 pencil or blue or black ink . Do not make any stray marks or some answers may be counted as incorrect. (5) The answers are rounded off. Choose the closest to exact. There is no penalty for guessing. (6) Hand in the answer sheet separately. Where needed use g = 9 . 80 m/s 2
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77777 77777 1. A 100-N uniform plank leans against a frictionless wall as shown. The magnitude of the torque (about the point P) applied to the plank by the wall is: (1) 150 N · m (2) 100 N · m (3) 500 N · m (4) 66.7 N · m (5) 75 N · m 2. The ideal mechanical advantage is defined to be the ratio of the weight W to the force of the pull F P for equilibrium (i.e. W/F P in equilibrium). Assuming that the pulleys rotate without friction and without the rope slipping, what is the ideal mechanical advantage of the combination of pulleys shown in the figure? (1) 4
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This note was uploaded on 01/25/2011 for the course PHY 2048 taught by Professor Field during the Summer '08 term at University of Florida.

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2048_Spring09_Exam3 - 77777 Instructor(s...

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