practice+midterm+2b - Physics 140, Winter 2010 Second...

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Physics 140, Winter 2010 Second Midterm Exam: March 11, 2010 Physics Department, University of Michigan FORM 1 Please print your name: ____________________________________________ Your DISCUSSION SECTION or INSTRUCTOR:_________________________ INSTRUCTIONS AND INFORMATION 1. Fill in YOUR NAME, SECTION NUMBER and EXAM FORM NUMBER on the scantron. 2. RECORD YOUR ANSWERS ON THE SCANTRON USING A #2 PENCIL. Instructor Section #’s Prof. Gordon Kane 16,17,18 Dr. Wayne Lau 10, 11, 19, 20, 21 Dr. Michael Melnichuk 7, 24, 25, 26 Dr. Yuri Popov 4, 8, 9 Prof. Len Sander 12, 14, 15 Mr. Tim Cohen 5,6 3. Turn in this exam copy with your scantron answer sheet. 4. This is a 90-minute, closed book exam. You may use two 3” x 5” cards on which you have your favorite equations. You also may use a calculator but please do not share calculators. 5. All cell phones and other communication devices must be shut off and out of sight. 6. There are altogether 20 multiple choice questions. All questions are of equal value. 7. Equations that you may find useful: s f = s i + v 0 t + ½ a t 2 θ f = θ in + ω t + ½ α t 2 Rod, axis through one end I =1/3ML 2 v f = v 0 + at ω f = ω 0 + α t Rod, axis through center: I = 1/12ML 2 a rad = v 2 /r = r ω 2 v t = r ω , a t = r α Solid sphere: I = 2/5 MR 2 F = m a τ = r × F = d L /dt=I α Hollow sphere: I = 2/3 MR 2 p = m v L = r × p = I ω Solid cylinder: I = ½ MR 2 W = F . s W = τ ( θ 2 θ 1 ) K Hollow cylinder I = ½M(R 1 2 +R 2 2 ) F = −∇ U F k = μ k N Hoop: I = MR 2 F rad = mv 2 /r U spring = ½ kx 2 Impulse J = F .dt = Δ p W = Δ K I = I cm + MR 2 P = Δ W/ Δ t = F.v Δ K + Δ U = W n.c. K rot = ½ I ω 2 in , 2 2 1 2 in , 1 2 1 2 1 f , 1 v m m m 2 v m m m m v + + + = in . 2 2 1 1 2 in , 1 2 1 1 f , 2 v m m m m v m m m 2 v + + + =
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Problem 1: The angular momentum of a system is constant when: A. the total kinetic energy is constant. B. no net external force acts on the system. C. the linear momentum and the energy are constant. D. no external torque acts on the system. E. the moment of inertia is constant. Problem 2: An electric fan is turned off, and its angular velocity decreases uniformly from 500 rev/min to 200 rev/min in 4.0 s. How many revolutions has the fan made during those 4.0 s? A. 11.7 revs B. 23.3 revs C. 43.6 revs D. 75.0 revs E. 116.5 revs
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Problem 3: A graph in figure shows potential energy versus position for a particle moving in a straight line (along the x-axis). From this curve and for the region displayed, we deduce that: A.
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This note was uploaded on 01/30/2012 for the course PHYS 140 taught by Professor Uher during the Winter '10 term at University of Michigan.

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practice+midterm+2b - Physics 140, Winter 2010 Second...

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