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(c) The energy that appears as kinetic energy is originally in the form of potential energy
in the compressed spring. Thus,
KU
k
x
i
max
==
1
2
2
, where
k
is the spring constant and
x
is
the compression. Thus,
x
K
k
=
2
267
640
046
..
J
Nm
m
b
g
55. (a) The vertical forces acting on the block are the normal force, upward, and the force
of gravity, downward. Since the vertical component of the block's acceleration is zero,
Newton's second law requires
F
N
=
mg
, where
m
is the mass of the block. Thus
f
=
μ
k
F
N
=
k
mg
. The increase in thermal energy is given by
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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, Acceleration, Force, Gravity, Mass

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