28.做俯卧撑运动的人可视为杠杆.如图所示,一同学重500N,P点为重心,他每次将身体撑起,肩部上升O.4m.某次测试中.他1min内完成30次俯卧撑.(2)将身体匀速撑起,双手对地面的压力.(3)将身体撑起
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![28.做俯卧撑运动的人可视为杠杆.如图所示,一同学重500N,P点为重心,他每次将身体撑起,肩部上升O.4m.某次测试中.他1min内完成30次俯卧撑.(2)将身体匀速撑起,双手对地面的压力.(3)将身体撑起](/uploads/image/z/1519970-50-0.jpg?t=28%EF%BC%8E%E5%81%9A%E4%BF%AF%E5%8D%A7%E6%92%91%E8%BF%90%E5%8A%A8%E7%9A%84%E4%BA%BA%E5%8F%AF%E8%A7%86%E4%B8%BA%E6%9D%A0%E6%9D%86.%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E4%B8%80%E5%90%8C%E5%AD%A6%E9%87%8D500N%2CP%E7%82%B9%E4%B8%BA%E9%87%8D%E5%BF%83%2C%E4%BB%96%E6%AF%8F%E6%AC%A1%E5%B0%86%E8%BA%AB%E4%BD%93%E6%92%91%E8%B5%B7%2C%E8%82%A9%E9%83%A8%E4%B8%8A%E5%8D%87O.4m%EF%BC%8E%E6%9F%90%E6%AC%A1%E6%B5%8B%E8%AF%95%E4%B8%AD%EF%BC%8E%E4%BB%961min%E5%86%85%E5%AE%8C%E6%88%9030%E6%AC%A1%E4%BF%AF%E5%8D%A7%E6%92%91.%282%29%E5%B0%86%E8%BA%AB%E4%BD%93%E5%8C%80%E9%80%9F%E6%92%91%E8%B5%B7%2C%E5%8F%8C%E6%89%8B%E5%AF%B9%E5%9C%B0%E9%9D%A2%E7%9A%84%E5%8E%8B%E5%8A%9B.%283%29%E5%B0%86%E8%BA%AB%E4%BD%93%E6%92%91%E8%B5%B7)
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