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32
2
1
(2.0 10 N/m)[(0.050 m)
(0.040 m) ]
0.90 J.
2
s
W
=×
−
=
(b) Moving from
5.0 cm
i
x
=+
to
2.0 cm
x
=−
, we have
2
1
( 0.020 m) ]
2.1 J.
2
s
W
−
−
=
(c) Moving from
i
x
to
x
, we have
2
1
( 0.050 m) ]
0 J.
2
s
W
−
−
=
31. The work done by the spring force is given by Eq. 725:
22
1
()
2
s
if
Wk
x
x
.
The spring constant
k
can be deduced from Fig. 737 which shows the amount of work
done to pull the block from 0 to
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This note was uploaded on 05/17/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.
 Spring '08
 Any
 Physics, Force, Work

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