大家好,歡迎來到Yogi霸霸解題給你看,今天我要講解的是AP Physics C裡Rotation的作業。

這個問題基本就是用 conservation of angular momentum來做就可以了

In the figure below, a 30 kg child stands on the edge of a stationary merry-go-round of radius 2.1 m. The rotational inertia of the merry-go-round about its rotation axis is 150 kg∙m^2. The child catches a ball of mass 1.1 kg thrown by a friend. Just before the ball is caught, it has a horizontal velocity v with arrow of magnitude 14 m/s, at angle ∅=37° with a line tangent to the outer edge of the merry-go-round, as shown. What is the angular speed of the merry-go-round just after the ball is caught?