质量为60kg的小明站在水平地面上,利用如图29所示装置提升物体A.物体A的质量mA为72kg,底面积SA为2×10-2m2.当小明施加竖直向下的拉力为F1时,物体A未被拉动,此时物体A对地面的压强p为5×103Pa,小明
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![质量为60kg的小明站在水平地面上,利用如图29所示装置提升物体A.物体A的质量mA为72kg,底面积SA为2×10-2m2.当小明施加竖直向下的拉力为F1时,物体A未被拉动,此时物体A对地面的压强p为5×103Pa,小明](/uploads/image/z/4323210-42-0.jpg?t=%E8%B4%A8%E9%87%8F%E4%B8%BA60kg%E7%9A%84%E5%B0%8F%E6%98%8E%E7%AB%99%E5%9C%A8%E6%B0%B4%E5%B9%B3%E5%9C%B0%E9%9D%A2%E4%B8%8A%2C%E5%88%A9%E7%94%A8%E5%A6%82%E5%9B%BE29%E6%89%80%E7%A4%BA%E8%A3%85%E7%BD%AE%E6%8F%90%E5%8D%87%E7%89%A9%E4%BD%93A.%E7%89%A9%E4%BD%93A%E7%9A%84%E8%B4%A8%E9%87%8FmA%E4%B8%BA72kg%2C%E5%BA%95%E9%9D%A2%E7%A7%AFSA%E4%B8%BA2%C3%9710-2m2.%E5%BD%93%E5%B0%8F%E6%98%8E%E6%96%BD%E5%8A%A0%E7%AB%96%E7%9B%B4%E5%90%91%E4%B8%8B%E7%9A%84%E6%8B%89%E5%8A%9B%E4%B8%BAF1%E6%97%B6%2C%E7%89%A9%E4%BD%93A%E6%9C%AA%E8%A2%AB%E6%8B%89%E5%8A%A8%2C%E6%AD%A4%E6%97%B6%E7%89%A9%E4%BD%93A%E5%AF%B9%E5%9C%B0%E9%9D%A2%E7%9A%84%E5%8E%8B%E5%BC%BAp%E4%B8%BA5%C3%97103Pa%2C%E5%B0%8F%E6%98%8E)
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