来自刘清革的问题
一道物理题.起重机吊着质量是3000千克的货物以1米/秒的速度匀速上升,钢绳对货物的拉力有多大当它以0.5米/秒的速度匀速下降时,钢绳对货物的拉力有多大
一道物理题.
起重机吊着质量是3000千克的货物以1米/秒的速度匀速上升,钢绳对货物的拉力有多大当它以0.5米/秒的速度匀速下降时,钢绳对货物的拉力有多大
1回答
2020-11-08 06:18
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裴志强
当等于1m/s由于匀速运动所以不具有加速度拉力等于重力为30000N而0.5ms下降的时候由于任匀速运动所以任不具有加速度所以拉力任等于重力为30000N
2020-11-08 06:23:22
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