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340_Physics ProblemsTechnical Physics

# 340_Physics ProblemsTechnical Physics - 342 P11.45 Angular...

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342 Angular Momentum P11.45 (a) I m r m d m d m d m d i i = = F H G I K J + F H G I K J + F H G I K J = 2 2 2 2 2 4 3 3 2 3 7 3 m m m 1 2 3 d d P 2 3 d FIG. P11.45 (b) Think of the whole weight, 3 mg , acting at the center of gravity. τ = × = F H G I K J × = r F i j k d mg mgd 3 3 ± ± ± e j e j b g (c) α τ = = = I mgd md g d 3 7 3 7 2 counterclockwise (d) a r g d d g = = F H G I K J F H G I K J = α 3 7 2 3 2 7 up The angular acceleration is not constant, but energy is. K U E K U m g d I i f f + + = + + F H G I K
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