290_Physics ProblemsTechnical Physics

290_Physics ProblemsTechnical Physics - 292 Rotation of a...

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292 Rotation of a Rigid Object About a Fixed Axis P10.17 (a) ωπ π == F H G I K J = 2 2 1200 126 f rad 1 rev rev 60.0 s rad s (b) vr × = ω 126 3 00 10 3 77 2 rad s m m s bg ej .. (c) ar c × = 2 2 2 126 8 00 10 1 260 a f . m s 2 so a r = 126 . km s toward the center 2 (d) sr r t == = × = θω 126 8 00 10 2 00 20 1 2 rad s m s m af . P10.18 The force of static friction must act forward and then more and more inward on the tires, to produce both tangential and centripetal acceleration. Its tangential component is m 170 . m s 2 . Its radially inward component is mv r 2 . This takes the maximum value m r mr mr m r m a m fi t ωω α θ πα 22 20 2 2 =+= + F H G I K J = s 2 . With skidding impending we have Fm a yy = , +− = nm g 0, g = fn m g m m g ss s s = + =+ = µµ µπ 2 2 2 2 10 5 7 2 . . ms 2 *P10.19 (a) Let R E represent the radius of the Earth. The base of the building moves east at vR 1 = E where is one revolution per day. The top of the building moves east at
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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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