ch07-p027 - 27. From Eq. 7-25, we see that the work done by...

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32 2 1 (9.0 10 N/m)[(0.050 m) ( 0.050 m) ] 0 J. 2 s W = (d) Moving from 5.0 cm i x =+ to 9.0 cm x =− , we have 2 1 (9.0 10 N/m)[(0.050 m) ( 0.090 m) ] 25 J. 2 s W = 27. From Eq. 7-25, we see that the work done by the spring force is given by 22 1 () 2 s if Wk x x . The fact that 360 N of force must be applied to pull the block to x = + 4.0 cm implies that the spring constant is 3 360 N 90 N/cm 9.0 10 N/m 4.0 cm k
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