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Unformatted text preview: 77777 77777 Instructor(s): Saab/Sabin PHYSICS DEPARTMENT PHY 2048 Exam 3 December 6, 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 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) The answers are rounded off. Choose the closest to exact. There is no penalty for guessing. If you believe that no listed answer is correct, leave the form blank. (6) Hand in the answer sheet separately. 77777 77777 1. A meter stick on a horizontal frictionless table top is pivoted at the 80- cm mark. Two forces are applied to the stick, both of them horizontal ( i.e., in the plane of the table), and perpendicular to the stick. One force, ~ F 1 , acts on the end of the stick at 0 cm as shown. A second force ~ F 2 (not shown) is applied perpendicularly at the 100-cm end of the stick. If the stick does not move, the force exerted by the pivot on the stick: 0 cm 20 cm 40 cm 60 cm 80 cm 100 cm F 1 pivot (1) must be directed opposite to ~ F 1 and have magnitude | ~ F 2 | + | ~ F 1 | (2) must be in the same direction as ~ F 1 and have magnitude | ~ F 2 | - | ~ F 1 | (3) must be directed opposite to ~ F 1 and have magnitude | ~ F 2 | - | ~ F 1 | (4) must be in the same direction as ~ F 1 and have magnitude...
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