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Quiz10_key

# Quiz10_key - O 1 is 6 rad/s 2(a Find the belt velocity υ b...

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PHYS 2305 CHANG: Quiz 10, Spring 2009 Name (print)_______________________ KEY ________________________ I have neither given nor received any unauthorized aid on this quiz. Pledge ______________________________________________ Instructions : Show your work to receive credit , and present your answers with 3 significant figures and proper units . 1. A wheel starts to rotate from rest with a constant angular acceleration. It reaches its highest angular velocity in 16 s, and then maintains the same speed. If the wheel rotates a total angle of 2800 rad in a total time of 43 seconds, find the angular acceleration of the wheel. _______ 5 rad/s 2 _________ O 1 O 2 A B a b υ b 2. A belt passes over two pulleys O 1 (radius R 1 = 0.6 m) and O 2 (radius R 2 = 0.8 m) as shown, and points A and B are on the rim of the pulleys. The normal acceleration at A is 2.4 m/s 2 and the angular acceleration of pulley
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Unformatted text preview: O 1 is 6 rad/s 2 . (a) Find the belt velocity. υ b = ________ 1.2 m/s ____________ (b) Find the belt acceleration. a b = ________ 3.6 m/s 2 __________ (c) Find the acceleration of B . a B = ________ 4.02 m/s 2 __________ 3. A spinning blade is 1.6 m long and is pivoted at its center. At t = 0 s, the normal acceleration at the tip of the blade is 5 m/s 2 . The blade is rotating with a constant angular acceleration, and when t = 6 s the blade rotates through an angle of 24 rad. Find the speed at the tip of the blade at t = 6 s. ________ 4.4 m/s __________ 8 m 3 m O 30° F 1 = 150 N F 2 = 100 N 4. Find the total torque about the pivot O by the two forces F 1 and F 2 on the angled rod. Also indicate the direction of the total torque. ________ 250 N·m _ CCW _________...
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