Quiz09_13solutions

2 f1 f2 216 24 40 rads2 mr 10 40

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Unformatted text preview: he plane of the page, has two tangential forces acting on it as shown, F1 = 16 N and F2 = 24 N. The disk is of mass m = 1.0 kg and radius R = 4.0 m. What is the angular acceleration of the disk? (Take counterclockwise to be positive and use I = (1/2)mR2 for rotation of a disk around an axis through its center of mass.) Solution: Using ! net = I" = 1 mR 2" , and with CCW torque defined as positive, 2 1 F1R ! F2 R = mR 2! , or 2 != 2( F1 ! F2 ) 2(16 ! 24) = = !4.0 rad/s2 . mR (1.0 )( 4.0 ) This is negative, so the acceleration is CW, and the acceleration vector points into the page. Physics 221 Quiz 9 Spring 2013 Name Section___________ Quiz 9C 1.) Find the moment of inertia of...
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This document was uploaded on 03/12/2014 for the course PHYS 221 at Iowa State.

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