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範例:角動量守恆與等速率圓周運動

如圖,光滑桌面中心穿有一孔,用繩繫5kg的物體A,通過此孔繞中心作等速圓周運動,半徑2m,速率10m/s,(1)繩的另一端需吊物B之質量應為若干才能維持平衡?(5)(2)桌下的一端改用手握住向下拉1m,需作功多少焦耳?(5)84北聯】(g=10 m/s2)


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