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2048_Fall10_FinalExam - 77777 77777 PHYSICS DEPARTMENT PHY...

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77777 77777 PHYSICS DEPARTMENT PHY 2048 Final Exam 10:00 am, December 11, 2010 Name (print): 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 pink answer sheet (use 76–80 for the 5-digit number) . Code your name on your answer sheet. Darken circles completely. Code your UF ID number on your answer sheet. (2) Print your name on this sheet and sign it also. (3) Do all scratch work on this exam to the right of the questions, and anywhere else on this exam that you like. At the end of the test, this exam printout is to be turned in. No credit will be given without both the answer sheet and printout, with the scratch work which most questions demand of anyone. (4) You will receive one point for each correct answer and zero points for an incorrect answer or no answer. (5) Use a number 2 pencil on the answer sheet. Do not make any stray marks, or the answer sheet may not be read properly. >>>>>>>> BEFORE YOU FINISH <<<<<<<< Fold the computer printout so your name is on top, include any figure sheet inside the printout. Hand in the answer sheet separately. 1. A double-decker bus is traveling at 10 m / s. A child in the bus throws a ball horizontally out of the window from a height of 5 m above ground level, with a velocity of 5 m / s in the direction perpendicular to the side of the bus. With what speed does the ball hit the ground (measured relative to the ground), in m/s? (1) 15 (2) 5 3 (3) 5 5 (4) 20 (5) 25 2. Two equal masses are on opposite ends of a 10 m long massless string which is hung on a massless frictionless pulley which is 8 m above the ground. Initially one mass is 5 m above the ground and moving downwards with a speed v = 5 m / s. How fast is it moving, in m/s, when it hits the ground?
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