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10.62. Set Up:
The freebody diagram for the arm is given in Figure 10.62. Take the pivot at the shoulder joint and
let counterclockwise torques be positive. Use coordinates as shown. Let
F
be the force exerted by the muscle. There
are also the weight of the arm and forces at the shoulder joint, but none of these forces produce any torque when the
arm is in this position. The forces
F
and
T
have been replaced by their
x
and
y
components.
Figure 10.62
Solve:
gives
10.63. Set Up:
The weight on the front wheels is
the normal force exerted by the ground on the front wheels.
The weight on the rear wheels is
the normal force exerted by the ground on the rear wheels. When the front wheels
come off the ground,
The freebody diagram for the truck without the box is given in Figure 11.63a and with
the box in Figure 11.63b. The center of gravity of the truck, without the box is a distance
x
from the rear wheels.
Figure 10.63
Solve:
in Figure 11.63a gives
in Figure 11.63a, with the axis at the rear wheels and counterclockwise torques positive, gives
and
(a)
in Figure 11.63b, with the axis at the rear wheels and counterclockwise torques positive, gives
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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
 Force

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