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23 Nov 2019
A girl of mass 30.9 kg stands on the rim of a frictionless merry-go-round of radius 0.714 m and rotational inertia 365 kg·m2 that is not moving. She throws a rock of mass 513 g horizontally in a direction that is tangent to the outer edge of the merry-go-round. The speed of the rock, relative to the ground, is 4.33 m/s. Afterward, what are (a) the angular speed of the merry-go-round and (b) the linear speed of the girl?
A girl of mass 30.9 kg stands on the rim of a frictionless merry-go-round of radius 0.714 m and rotational inertia 365 kg·m2 that is not moving. She throws a rock of mass 513 g horizontally in a direction that is tangent to the outer edge of the merry-go-round. The speed of the rock, relative to the ground, is 4.33 m/s. Afterward, what are (a) the angular speed of the merry-go-round and (b) the linear speed of the girl?
