L30_phys131_30nov07

# L30_phys131_30nov07 - The mass and radius of the disk are...

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Summary for Lecture 29 on November 28, 2007. Angular momentum ( 29 ( 29 ( 29 i f i f f i i i i i L L : conserved is momentum angular , torques outside no If L L dt , or dt dL body extended I L ) bodies like int po 2 ( sin v m r L . is CCW sin mv r L body like int po gle sin , momentum angular P r L body gle sin , momentum v m P = - = = = = + = × = = τ α θ θ r p θ

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A blob of clay is thrown directly at a tiny massless wall mounted on top of the outside rim of a rotating disk that pivots about its center. Initially, the disk is at rest. Then, the blob sticks to the tiny wall and the blob plus disk system begins rotating. What is the final angular rotation speed ϖ f of the blob plus disk system? The mass of the blob is 2 kg and its initial speed is 10 m/s.
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Unformatted text preview: The mass and radius of the disk are 10 kg and 0.5 m, respectively. I=1/2MR 2 for a disk. A view from the top is shown below: ( 29 ( 29 ( 29 ( 29 s rad 71 . 5 m 5 . kg . 5 kg 2 s m 10 kg 2 R M 2 1 m mv MR 2 1 mR Rmv I Rmv L L f f f 2 2 f f f i = + = + = + = = + = ϖ + because CCW m = 2 kg M = 10 kg v = 10 m/s R = 0.5m...
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## This note was uploaded on 04/09/2008 for the course PHYS 131 taught by Professor Reay during the Fall '08 term at Ohio State.

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L30_phys131_30nov07 - The mass and radius of the disk are...

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