332 Angular MomentumP11.19The vector from Pto the falling ball isrr varijj=+ +=++−FHGIKJiittgt1201222AAcos±sin±±θθejThe velocity of the ball isvv aj=+=−itgt0±SoLr v=×mLijjjLk=++−FHGIKJLNMOQP×−=−mgtgttAcos±sin±cos±θejej0122mlPFIG. P11.19P11.20In the vertical section of the hose, the water has zero angularmomentum about our origin (point Obetween the fireman’s feet).As it leaves the nozzle, a parcel of mass mhas angular momentum:Lmmrvm=°==rvsin....90 01 3012 516 3m msms2afbgThe torque on the hose is the rate of change in angular momentum.Thus,τ====⋅dLdtdmdt16 316 36 31103...kgsNm22viO1.30 mvfFIG. P11.20Section 11.3Angular Momentum of a Rotating Rigid Object
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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 .