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A boy of mass mboy stands at the edge of a merry­ go­ round of radius...

A boy of mass mboy stands at the edge of a merry­ go­ round of radius R = 8.2 m and mass mmgr and both are initially at rest. The boy then walks along the edge of the merry ­go ­round. After walking a distance of 20 m relative to the merry ­go ­round, the boy finds that the merry ­go ­round has rotated through an angle of 11°. Find the ratio

mboy /mmgr.

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