总长为L的光滑匀质铁链跨过一个光滑的轻小滑轮开始时下端A B相平齐,当略有扰动时其一端下落,
则在铁链刚脱离滑轮的瞬间,铁链的重力势能减少了多少?
人气：487 ℃ 时间：2020-04-15 10:04:12
解答
设滑轮处重力势能为0
原重力势能为-1/4mgl
现重力势能为-1/2mgl
减小的重力势能为1/4mgl
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