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Unformatted text preview: 77777 77777 Instructor(s): Mueller/Saab PHYSICS DEPARTMENT PHY 2048 Exam 3 December 8, 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 7680 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) Hand in the answer sheet separately. Where needed use g = 9 . 80 m/s 2 77777 77777 1. 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) 7 (2) 1 (3) 2 (4) 3 (5) 4 2. A uniform horizontal bar has length L and a weight of 100 N as shown in the figure. If the block has weight W = 200 N, what is the tension in the wire? (1) 500 N (2) 400 N (3) 200 N (4) 300 N (5) need to know L 3. The center of gravity coincides with the center of mass: (1) if the acceleration due to gravity is uniform over the body (2) always (3) never (4) if the center of mass is at the geometrical center of the body (5) if the body has a uniform distribution of mass 4. One point mass4....
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- Summer '08