仔细观察下图,试推导质点做半径为r的匀速圆周运动时向心加速度

仔细观察下图,试推导质点做半径为r的匀速圆周运动时向心加速度大小的表达式并说明向心加速度的方向。

答案

(4分,略,参见教科书)

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