2053_Fall10_Exam2 - 77777 77777 Instructor(s Mueller/Qiu...

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77777 77777 Instructor(s): Mueller/Qiu PHYSICS DEPARTMENT PHY2053 Exam 2 November 16, 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. If you believe that no listed answer is correct, leave the form blank. (6) Hand in the answer sheet separately. Use g = 9 . 80 m/s 2
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77777 77777 1. An angular speed of 1 rad/s corresponds to about: (1) 9.55 rev/min (2) 60 rev/min (3) 30 rev/min (4) 19.1 rev/min (5) 0.159 rev/min 2. A disk rotates about its central axis starting from rest at t = 0 and accelerates with constant angular acceleration. At one time it is rotating at 4 rev/s; 60 revolutions later, its angular speed is 16 rev/s. Starting at t = 0, what is the time required to complete 64 revolutions? (1) 8 s (2) 16 s (3) 4 s (4) 32 s (5) 24 s 3. An astronaut is being tested in a centrifuge. The centrifuge has a radius R and, in starting from rest at t = 0, rotates according to θ ( t ) = (0 . 5 rad/s 2 ) t 2 . At what time t > 0 is the magnitude of the tangential acceleration equal to the magnitude of the radial acceleration ( i.e., centripetal acceleration)? (1)
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2053_Fall10_Exam2 - 77777 77777 Instructor(s Mueller/Qiu...

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