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a mass m slides down along a circular track （radius r) from position a with no friction. when it arrives the position as figure, how much is the normal force n acted by the track？

A mass m slides down along a circular track (radius R) from position A with no friction. When it arrives the position as figure, how much is the normal force N acted by the track？

A、 a mass m slides down along a circular track （radiu

B、 a mass m slides down along a circular track （radiu

C、 a mass m slides down along a circular track （radiu

D、 a mass m slides down along a circular track （radiu

提问人：网友dl_wm007 发布时间：2022-01-07

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