Exam2_form2

# Exam2_form2 - Physics 140, Winter 2011 Second Midterm Exam...

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Physics 140, Winter 2011 Second Midterm Exam Physics Department, University of Michigan March 10, 2011 FORM 2 Please print your name: ____________________________________________ Your INSTRUCTOR:_________________________ INSTRUCTIONS AND INFORMATION 1. Fill in YOUR NAME, INSTRUCTOR and the EXAM FORM NUMBER on the scantron. 2. RECORD YOUR ANSWERS ON THE SCANTRON USING A #2 PENCIL. 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” card 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. Equations/values 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 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 W = F . s L = r × p = I ω Solid cylinder or disk: I = ½ MR 2 F k = μ k N W = τ ( θ 2 θ 1 ) K Hollow cylinder I = ½ M(R 1 2 +R 2 2 ) g = 9.8 m/s 2 U spring = ½ kx 2 Hoop: I = MR 2 F = −∇ U Impulse J = F .dt = Δ p I p = I cm + MR 2 W = Δ K P = Δ W/ Δ t = F.v K rot = ½ I ω 2 Δ K + Δ U = W n.c.

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Physics 140, Winter 2011, Midterm 2 Problem 1: A bat strikes a 0.14 kg baseball. Just before impact, the ball is traveling horizontally to the right at 50.0 m/s, and it leaves the bat traveling to the left at an angle of 30 o above the horizontal with a speed of 65.0 m/s. If the ball and bat are in contact for 1.75 ms, find the magnitude of the average force the bat exerted on the ball. A. 15.6 N B. 289 N C. 1468 N D. 5430 N E. 8892 N Problem 2: A rectangular sign of mass 20 kg hangs from the end of a horizontal uniform rod of mass 10 kg and length 2.5 m, which is supported by a wall hinge at its other end and by a wire making an angle θ = 30 ° with the rod, as shown. What is the tension in the wire? y
A. 310 N B. 355 N C. 400 N D. 445 N E. 490 N Physics 140, Winter 2011, Midterm 2 Problem 3: A 200-kg flywheel with radius of 30 cm is rotating at 3000 revolutions per minute. A brake is suddenly applied to it at t=0, causing a constant angular deceleration. If the flywheel comes to a stop after 4500 revolutions, what is the magnitude of the angular

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## This note was uploaded on 08/01/2011 for the course PHYSICS 140 taught by Professor Evrard during the Fall '07 term at University of Michigan.

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Exam2_form2 - Physics 140, Winter 2011 Second Midterm Exam...

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