【随堂训练】如图4所示,A、B、C质量分别为mA=0.7 kg,mB=0.2 kg,mC=0.1 kg,B为套在细绳上的圆环,A与水平桌面的动摩擦因数μ=0.2,另一圆环D固定在桌边,离地面高h2=0.3 m,当B、C从静止下降h1=0.3 m
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![【随堂训练】如图4所示,A、B、C质量分别为mA=0.7 kg,mB=0.2 kg,mC=0.1 kg,B为套在细绳上的圆环,A与水平桌面的动摩擦因数μ=0.2,另一圆环D固定在桌边,离地面高h2=0.3 m,当B、C从静止下降h1=0.3 m](/uploads/image/z/14694985-1-5.jpg?t=%E3%80%90%E9%9A%8F%E5%A0%82%E8%AE%AD%E7%BB%83%E3%80%91%E5%A6%82%E5%9B%BE4%E6%89%80%E7%A4%BA%2CA%E3%80%81B%E3%80%81C%E8%B4%A8%E9%87%8F%E5%88%86%E5%88%AB%E4%B8%BAmA%EF%BC%9D0.7+kg%2CmB%EF%BC%9D0.2+kg%2CmC%EF%BC%9D0.1+kg%2CB%E4%B8%BA%E5%A5%97%E5%9C%A8%E7%BB%86%E7%BB%B3%E4%B8%8A%E7%9A%84%E5%9C%86%E7%8E%AF%2CA%E4%B8%8E%E6%B0%B4%E5%B9%B3%E6%A1%8C%E9%9D%A2%E7%9A%84%E5%8A%A8%E6%91%A9%E6%93%A6%E5%9B%A0%E6%95%B0%CE%BC%EF%BC%9D0.2%2C%E5%8F%A6%E4%B8%80%E5%9C%86%E7%8E%AFD%E5%9B%BA%E5%AE%9A%E5%9C%A8%E6%A1%8C%E8%BE%B9%2C%E7%A6%BB%E5%9C%B0%E9%9D%A2%E9%AB%98h2%EF%BC%9D0.3+m%2C%E5%BD%93B%E3%80%81C%E4%BB%8E%E9%9D%99%E6%AD%A2%E4%B8%8B%E9%99%8Dh1%EF%BC%9D0.3+m)
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