[考古] 中正92年
1.Aparticle of mass M moves in the xy plane . its coordinates as a function
of time are given by x(t)=2t^3,y(t)=2t^2-3t . (a)Find its angular momentum
about the origin. (b)what force acts on it?
他要求角動量與力
微分?
那半徑?
力?
加速度?
麻煩高手指點一下我已經很久沒碰物理了
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