p08_001.pdf

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Chapter 8 - 8.1

1. The potential energy stored by the spring is given by U = 2 kx 2 ,where k is the spring constant and x

is the displacement of the end of the spring from its position when the spring is in equilibrium. Thus

k = 2 U

x 2

2(25 J)

(0 . 075 m) 2 =8 . 9

10 3 N / m .