356_Physics ProblemsTechnical Physics

356_Physics ProblemsTechnical Physics - 358*P12.21 Static...

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358 Static Equilibrium and Elasticity *P12.21 (a) We model the horse as a particle. The drawbridge will fall out from under the horse. α θ == = ° = mg m g 1 2 0 1 3 2 0 3 2 3 9 80 20 0 2800 173 A A A cos cos .c o s . . . ms m rad s 2 2 ej af (b) 1 2 2 Im g h ω = ∴⋅ = ⋅ 1 2 1 3 1 2 1 22 0 mm g AA ωθ sin bg R y R x mg 0 A FIG. P12.21(a) ∴= = °= 3 1 3980 800 12 01 5 6 0 g A sin . . sin . ±ms m rad s 2 (c) The linear acceleration of the bridge is: a = 1 2 1 2 80 6907 A .. . m r a d s m s The force at the hinge + the force of gravity produce the acceleration a = . m s 2 at right angles to the bridge. Rm a xx ° = 2 000 6 907 250 4 72 kg m s kN 2 o s . gm a yy −= R y R x mg 0 a FIG. P12.21(c)
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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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