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Final_Exam_F04_v3

# Final_Exam_F04_v3 - NAME Recitation Instructor Physics 112...

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NAME 2 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 0 0.5 1 1.5 2 Time (s) Position (cm) I. SHORT ANSWER [40 points] Please write your answers in the spaces provided. 1. [4 points] What is the approximate quality factor Q for this damped harmonic oscillation? (A) < 1 (B) 1 (C) 3 (D) 10 (E) 30 (F) 100 (G) 300 (H) 1000 (K) > 1000 Answer: 2. [4 points] A spool resting on a horizontal surface has a string wrapped around its axle, as shown. When the string is pulled, which way will the spool roll? (A) To the right ( ) (B) To the left ( ) (C) It won't roll. Answer: 3. [6 points] A bowling ball starts sliding to the left ( ) with speed v o on a horizontal surface without spinning. As the ball slides along the surface, it begins to spin, eventually rolling to the left without slipping with speed v f and Final Initial angular speed ω f . The bowling ball's radius = R, mass = m, and moment of inertia about its center-of-mass = I CM . Which of the following statements is/are true ? Please list the letters for all that apply. (A) mv o = mv f + I CM ω f (D) mv o = (mv f ) 2 + (I CM ω f ) 2 (B) 1 2 mv o 2 = 1 2 mv f 2 + 1 2 I CM ω f 2 (E) v o = R ω f (C) mv o R = mv f R + I CM ω f (F) v f = R ω f (G) None of these are true. Answer: Pull v o v f ω f
NAME 3 4. [12 points] A spinning wheel of mass M and radius R is precessing freely on a fixed pivot, as shown.

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