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354_Physics ProblemsTechnical Physics

# 354_Physics ProblemsTechnical Physics - 356 P12.15 Static...

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356 Static Equilibrium and Elasticity P12.15 (a) Taking moments about P , R R R sin . cos . . . . . 30 0 0 30 0 5 00 150 30 0 0 1 039 2 1 04 ° + ° = = = a f a fa f a fa f cm N cm N kN The force exerted by the hammer on the nail is equal in magnitude and opposite in direction: 1 04 . kN at 60 upward and to the right. ° (b) f R = °− = sin . 30 0 150 370 N N n R = °= = + cos . ± ± 30 0 900 370 900 N N N surface F i j a f a f FIG. P12.15 P12.16 See the free-body diagram at the right. When the plank is on the verge of tipping about point P , the normal force n 1 goes to zero. Then, summing torques about point P gives τ p mgd Mgx = − + = 0 or x m M d = F H G I K J . From the dimensions given on the free-body diagram, observe
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