2048_Spring10_Exam3

2048_Spring10_Exam3 - 77777 77777 Instructor(s...

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Unformatted text preview: 77777 77777 Instructor(s): Matcheva/Sabin PHYSICS DEPARTMENT PHY 2048 Exam 3 April 14, 2010 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 77777 77777 1. A uniform plank is 6 m long and weighs 80 N. It is balanced on a sawhorse at its center. An additional 160 N weight is now placed on the left end of the plank. To keep the plank balanced, the sawhorse must be moved what distance to the left? (1) 2 m (2) 6 m (3) 1.5 m (4) 1 m (5) 0.5 m 2. In the figure, a uniform sphere with a weight of 5 N and radius r is held in place by a massless rope attached to a frictionless wall a vertical distance L above the center of the sphere. If r = 3 L/ 5, what is the magnitude of the force on the sphere from the wall? (1) 3 N (2) 5 N (3) 1.5 N (4) 3.75 N (5) 2 N 3. In the figure, a climber leans out against a vertical ice wall that has negligible friction. The distance a = 3 L/ 5. His center of mass is a distance d = 0 . 4 L from the feet-ground contact point. If he is on the verge of slipping, what is the coefficientfeet-ground contact point....
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2048_Spring10_Exam3 - 77777 77777 Instructor(s...

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