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 , RR R sin . cos . . . .. 30 0 0 30 0 5 00 150 30 0 0 10392 104 °+ ° = == a f a f af a f cm N cm N k N The force exerted by the hammer on the nail is equal in magnitude and opposite in direction: . kN at 60 upward and to the right. ° (b) fR = sin . 30 0 150 370 N nR = =+ cos . ±± 30 0 900 370 900 N N surface Fi j 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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This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .

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