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(c) Reflect:
The tension is radial while the displacement is tangent to the circular path; thus there is no component
of the tension along the direction of the displacement and the tension in the ropes does no work on the child.
7.49. Set Up:
Apply
to the motion of the stone on the moon with
and
at the
maximum height. The conservation equation becomes
with
and
Setting
and
gives
Note that
is the same on the earth and moon and let subscript 1
refer to the moon and subscript 2 refer to the earth.
Solve:
Reflect:
Gravity is stronger on earth so a larger initial speed is needed in order to achieve the same height as on the
moon.
7.50 Set Up:
Use
with
and
Also apply
and
with
to obtain
Solve: (a)
which is constant, so
and,
(b)
(c)
Now
is constant, so
Solving for
7.51. Set Up:
Apply
with
and
the result is
Since
is constant,
Solve:
7.51. Set Up:
In part (a), substitute
into
to obtain
Also let subscript 1
refer to the stronger spring and 2 to the weaker spring. Then
and
In part (b), apply
which results in
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This note was uploaded on 03/06/2009 for the course PHYS 114 taught by Professor Shoberg during the Spring '07 term at Pittsburg State Uiversity.
 Spring '07
 Shoberg
 Energy, Work

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