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358_Physics ProblemsTechnical Physics

# 358_Physics ProblemsTechnical Physics - 360 P12.24 Static...

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360 Static Equilibrium and Elasticity P12.24 x L = 3 4 If the CM of the two bricks does not lie over the edge, then the bricks balance. If the lower brick is placed L 4 over the edge, then the second brick may be placed so that its end protrudes 3 4 L over the edge. L x FIG. P12.24 P12.25 To find U , measure distances and forces from point A. Then, balancing torques, 0 750 29 4 2 25 .. . a f a f U = U = 88 2 . N To find D , measure distances and forces from point B. Then, balancing torques, 0750 150 294 . af a f a f D = D = 58 8 Also, notice that UDF g =+ , so F y = 0. *P12.26 Consider forces and torques on the beam. F x = 0 : RT cos cos θ −° = 53 0 F y = 0: sin sin = 53 800 0 N
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