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licorice could “spring back” to its original shape. Still, to the extent that
Uk
x
=
1
2
2
applies, the graph is a parabola (not shown here) which has its vertex at the origin and is
either concave upward or concave downward depending on how one wishes to define the
sign of
F
(the connection being
F
= –
dU
/
dx
).
(e) As a crude estimate, the area under the curve is roughly half the area of the entire
plottingarea (8000 N by 12 mm). This leads to an approximate work of
1
2
(8000 N) (0.012 m)
≈
50 J. Estimates in the range 40
≤
W
≤
50 J are acceptable.
(f) Certainly dissipative effects dominate this process, and we cannot assign it a
meaningful potential energy.
125. (a) The compression is “springlike” so the maximum force relates to the distance
x
by Hooke's law:
Fk
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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, Energy, Force, Potential Energy, Work

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