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problem29_73

problem29_73 - 29.73 a G(0 r cm m g summed over each leg m...

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29.73: a) , g r τ m cm G × = summed over each leg, ) 90 sin( 4 2 ) 90 sin( 4 2 ) 90 sin( 4 ) 0 ( φ - + - + - = g m L g m L g m ) 90 sin( 4 ) ( - + g m L ). (clockwise cos 2 mgL = sin IAB B = × = B μ τ (counterclockwise). . sin sin cos ϖ ε R BA dt d R BA dt d R BA R I = - = = = The current is going counterclockwise looking to the k ˆ - direction. , sin sin 2 4 2 2 2 2 τ R L B R A B B = = , sin cos 2 so 2 4 2 R L B mgL - = opposite to the direction of the rotation. b) α I τ = ( I being the moment of inertia). About this axis . 12 5
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