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12
2
3
8
2
5
(graph area)
(8.0 10
m )(8.0 10 m)(4.74 10 N/m )
3.03 10 J.
KW A
L
−−
−
==
=
×
×
×
=
×
(b) The kinetic energy of the fruit fly of mass 6.00 mg and speed 1.70 m/s is
26
2
6
11
(6.00 10
kg)(1.70 m/s)
8.67 10 J.
22
ff
f
Km
v
==×
=
×
(c) Since
f
KW
<
, the fruit fly will not be able to break the thread.
(d) The kinetic energy of a bumble bee of mass 0.388 g and speed 0.420 m/s is
242
5
(3.99 10
kg)0.420 m/s)
3.42 10 J.
bb
b
v
=
×
(e) On the other hand, since
b
>
, the bumble bee will be able to break the thread.
48. Since the force is (stress × area) and the displacement is (strain × length), we can
write the work integral (eq. 732) as
W
=
Fdx
³
=
(stress)
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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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