1.质量2.7kg正方体铝块放在1m²水平桌面中央,桌面受到的压强为1000Pa,则说明铝块受到竖直向上的拉力是多大?(p铝=2.7x10的3次方kg/m三次方)2.在一块质量为20kg,厚度为5cm的松木上,装上700kg的
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![1.质量2.7kg正方体铝块放在1m²水平桌面中央,桌面受到的压强为1000Pa,则说明铝块受到竖直向上的拉力是多大?(p铝=2.7x10的3次方kg/m三次方)2.在一块质量为20kg,厚度为5cm的松木上,装上700kg的](/uploads/image/z/13018965-69-5.jpg?t=1.%E8%B4%A8%E9%87%8F2.7kg%E6%AD%A3%E6%96%B9%E4%BD%93%E9%93%9D%E5%9D%97%E6%94%BE%E5%9C%A81m%26sup2%3B%E6%B0%B4%E5%B9%B3%E6%A1%8C%E9%9D%A2%E4%B8%AD%E5%A4%AE%2C%E6%A1%8C%E9%9D%A2%E5%8F%97%E5%88%B0%E7%9A%84%E5%8E%8B%E5%BC%BA%E4%B8%BA1000Pa%2C%E5%88%99%E8%AF%B4%E6%98%8E%E9%93%9D%E5%9D%97%E5%8F%97%E5%88%B0%E7%AB%96%E7%9B%B4%E5%90%91%E4%B8%8A%E7%9A%84%E6%8B%89%E5%8A%9B%E6%98%AF%E5%A4%9A%E5%A4%A7%3F%EF%BC%88p%E9%93%9D%3D2.7x10%E7%9A%843%E6%AC%A1%E6%96%B9kg%2Fm%E4%B8%89%E6%AC%A1%E6%96%B9%EF%BC%892.%E5%9C%A8%E4%B8%80%E5%9D%97%E8%B4%A8%E9%87%8F%E4%B8%BA20kg%2C%E5%8E%9A%E5%BA%A6%E4%B8%BA5cm%E7%9A%84%E6%9D%BE%E6%9C%A8%E4%B8%8A%2C%E8%A3%85%E4%B8%8A700kg%E7%9A%84)
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