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A horizontal circular disk with mass m and radius 2r can rotate easily about its...

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A horizontal circular disk with mass m and radius 2r can rotate easily about its vertical axis of symmetry O A small boy with mass km starts in A when the system is at rest and runs along the outer edge of the disk At B he goes radially inwards to C and continues along a quarter cincle anc to D How big an angle has the disc turmed when the boy has returned to A You have to draw the free body diagram The answaer of the question is w 4 2mr 1 104

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