The load bar of negligible weight is screwed in place between the walls
of the truck bed in order to keep loads from shifting as shown in
(Figure 1).
Determine the torsional moment M that must be applied to the center of the bar so that it produces a compression in the bar of 75lb. The square-threaded screw at A has
a lead of 0.2 in. and a radius of 0.5 in., and the coefficient of static friction between the bar and the screw is mu _(s)=0.3.
Express your answer in pound-inches to three significant figures.
lb* in
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Part B
Also, what amount of horizontal force F must be applied to the center of the bar to pull it out? The coefficient of static friction between the walls of the truck and the end
pads is mu _(s)=0.7.
Express your answer in pounds to three significant figures.
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The load bar of negligible weight is screwed in place between the walls of the truck bed in order to keep loads from shifting as shown in (Figure _1).
Determine the torsional moment M that must be applied to the center of the bar so that it produces a compression in the bar of 75 Ib. The square-threaded screw at A has
Express your answer in pound-inches to three significant figures.
33.3
lb - in
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Part B
Also, what amount of horizontal force F must be applied to the center of the bar to pull it out? The coeffcient of static friction between the walls of the truck and the end pads is = 0.7. Express your answer in pounds to three significant figures.
F = 105 Ib
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