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101119 - Physics 121 Physics 121 1 Physics 121 2 Ei = E f 1...

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Physics 121 11/19/10 Prof. E. F. Redish 1 11/19/10 1 Physics 121 11/19/10 2 Physics 121 11/19/10 3 Physics 121 E i = E f 1 2 mv i 2 + 1 2 I ± i 2 + mgh i = 1 2 mv f 2 + 1 2 I ± f 2 + mgh f mgh = 1 2 mv f 2 + 1 2 I ± f 2 ± = v / R mgh = 1 2 mv f 2 + 1 2 I v f R ² ³ ´ µ · 2 = 1 2 mv f 2 + 1 2 I R 2 ² ³ ´ µ · v f 2 = 1 2 m 1 + I mR 2 ¸ ¹ º » ¼ ½ v f 2 v f 2 = 2 gh 1 + I mR 2 ¸ ¹ º » ¼ ½
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