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Unformatted text preview: 77777 77777 Instructor(s): Profs. D. Reitze, H. Chan PHYSICS DEPARTMENT PHY 2053 Exam 2 April 2, 2009 Name (print, last first): Signature: On my honor, I have neither given nor received unauthorized aid on this examination. YOUR TEST NUMBER IS THE 5DIGIT 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 5digit 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. There are 2 blank sheets at the end if you need more space. 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. Constants: G = 6 . 67 × 10 11 N m 2 /kg 2 g = 9 . 80 m/s 2 1. A pingpong ball with mass 50 g hits a wall at a speed of 2.0 m/s perpendicular to the surface. It bounces back with the same speed. Find the magnitude of the average force exerted on the ball by the wall if the ball is in contact with the wall for 0.20 s. (1) 1.0 N (2) 0.50 N (3) 0.040 N (4) 0.020 N (5) 0.10 N 2. A pingpong ball with mass 50 g hits a wall at a speed of 4.0 m/s perpendicular to the surface. It bounces back with the same speed. Find the magnitude of the average force exerted on the ball by the wall if the ball is in contact with the wall for 0.20 s. (1) 2.0 N (2) 1.0 N (3) 0.080 N (4) 0.040 N (5) 0.40 N 3. A pingpong ball with mass 50 g hits a wall at a speed of 7.0 m/s perpendicular to the surface. It bounces back with the same speed. Find the magnitude of the average force exerted on the ball by the wall if the ball is in contact with the wall for 0.20 s. (1) 3.5 N (2) 1.8 N (3) 0.14 N (4) 0.070 N (5) 1.2 N 4. A 10g bullet was traveling at 200 m/s when it hit a 2.0kg ballistic pendulum. After the collision, the bullet remains stuck in the pendulum. Find the maximum height reached by the pendulum after the collision. (1) 0.051 m (2) 0.11 m (3) 0.52 m (4) 0.035 m (5) 0.37 m 5. A 10g bullet was traveling at 250 m/s when it hit a 2.0kg ballistic pendulum. After the collision, the bullet remains stuck in the pendulum. Find the maximum height reached by the pendulum after the collision. (1) 0.079 m (2) 0.15 m (3) 0.75 m (4) 0.042 m (5) 0.43 m 6. A 10g bullet was traveling at 150 m/s when it hit a 2.0kg ballistic pendulum. After the collision, the bullet remains stuck in the pendulum. Find the maximum height reached by the pendulum after the collision....
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 Spring '06
 Buchler
 Physics, Angular Momentum, Kinetic Energy, Mass, Moment Of Inertia, kg, m/s

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