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Unformatted text preview: 77777 77777 Instructor(s): Matcheva/Sabin PHYSICS DEPARTMENT PHY 2048 Exam 2 March 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. (6) Hand in the answer sheet separately. Where needed use g = 9 . 80 m/s 2 77777 77777 1. If the momentum of an object is doubled, then its kinetic energy: (1) increases by a factor of 4 (2) increases by a factor of 2 (3) stays the same (4) decreases by a factor of 4 (5) decreases by a factor of 2 2. A 0.5 kg football is travelling at a speed of 15 m/s when it is caught and brought to rest in 0.02 s by a stationary receiver. What is the magnitude of the impulse delivered to the ball? (1) 7.5 J · s (2) 0.3 J · s (3) 0.15 J · s (4) 0.75 J · s (5) zero 3. A particle starts from rest at time t = 0 and moves along the x axis. If the net force on it is proportional to √ t , its kinetic energy is proportional to: (1) t 3 (2) t (3) t 2 (4) 1 √ t (5) none of these answers 4. A can of bolts and nuts is pushed 2 m along an x axis by a broom along the greasy (frictionless) floor of a car repair shop in a version of shuffleboard. The figure gives the work W done on the can by the constant horizontal force from...
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This note was uploaded on 01/25/2011 for the course PHY 2048 taught by Professor Field during the Summer '08 term at University of Florida.
- Summer '08