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5.23. Set Up:
Take
to be upward. The fish has the same upward acceleration as the elevator. Let
be the
upward force exerted on the fish by the spring balance;
F
is what the balance reads.
Solve: (a)
The freebody diagram for the fish is sketched in Figure 5.23.
Figure 5.23
gives
and
The weight of the fish is
(b)
and
from part (a).
The elevator is accelerating downward with
(d)
If the cable breaks,
and
The elevator is in freefall and the
balance reads zero.
5.24. Set Up: (a)
Set the tension
in the towrope between the plane and the first glider equal to its maximum
value,
Consider both gliders together as a single object, apply
and solve for
a
. Use
a
in a
constant acceleration equation to find the required runway length.
(b)
Apply
to the second glider and solve for the tension
in the towrope that connects the two gliders.
Solve: (a)
The freebody diagram for both gliders as a single object of mass
is given in Figure 5.24a.
gives
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 Spring '07
 Shoberg
 Acceleration, Force

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