Problem 248 To close a gate valve it is necessary to exert two forces of 60 lb at opposite sides of a handwheel 3 ft in diameter. Through an accident the wheel is broken and the valve must be closed by a thrusting bar through a slot in the valve stem and exerting a force 4 ft out from the center. Determine the force required and draw a free-body diagram of the bar.
Solution 248
$C = 60(3)$
$C = 180 \, \text{ lb}\cdot\text{ft}$
Equivalent torque for the lever
$T = C$
$4F = 180$
$F = 45 \, \text{ lb}$ answer
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