problem06_68

University Physics with Modern Physics with Mastering Physics (11th Edition)

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6.68: From Eq. (6.7), with 0 1 = x , 4 2 3 3 2 2 2 2 0 0 4 2 3 2 2 2 3 2 ) m / N 3000 ( ) m / N 233 ( ) m / N 0 . 50 ( 4 3 2 ) ( 2 2 x x x x c x b x k dx cx bx kx Fdx W x x + - = + - = + - = = a) When m 050 . 0 2 = x , J 115 . 0 = W , or 0.12 J to two figures. b) When m, 050 . 0 2 - = x J 173 . 0 = W , or 0.17 J to two figures. c) It’s easier to stretch the spring; the quadratic
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