336_Physics ProblemsTechnical Physics

336_Physics ProblemsTechnical Physics - 338 *P11.38 Angular...

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338 Angular Momentum *P11.38 (a) Let ω be the angular speed of the signboard when it is vertical. 1 2 1 2 1 3 1 2 1 31 3980 1 250 050 235 2 22 IM g h ML Mg L g L ωθ θ = F H G I K J =− ∴= = −° = cos cos .c o s . . . af ej ±ms m rad s 2 Mg m v 1 2 L FIG. P11.38 (b) II m v L ff i i ωω represents angular momentum conservation ∴+ F H G I K J + = + = 1 3 1 3 240 05 2347 04 16 0498 2 1 3 1 3 1 3 1 3 ML mL ML mvL ML mv Mm L fi f i ch bg b g b g .. . . . . . kg m rad s kg m s kg kg m rad s (c) Let h CM = distance of center of mass from the axis of rotation. h CM kg m kg m kg kg m = + + = 025 02857 . . . . Apply conservation of mechanical energy: g h M L m L L g h +− =+ F H G I K J + + L N M
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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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