如图9-4所示,动滑轮中2N,弹簧测力计的示数为10N,则拉力F和物体的重力分别为A.20N,18N B.10N,18N C.18N,10N D.20N,20N
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![如图9-4所示,动滑轮中2N,弹簧测力计的示数为10N,则拉力F和物体的重力分别为A.20N,18N B.10N,18N C.18N,10N D.20N,20N](/uploads/image/z/2017761-33-1.jpg?t=%E5%A6%82%E5%9B%BE9-4%E6%89%80%E7%A4%BA%2C%E5%8A%A8%E6%BB%91%E8%BD%AE%E4%B8%AD2N%2C%E5%BC%B9%E7%B0%A7%E6%B5%8B%E5%8A%9B%E8%AE%A1%E7%9A%84%E7%A4%BA%E6%95%B0%E4%B8%BA10N%2C%E5%88%99%E6%8B%89%E5%8A%9BF%E5%92%8C%E7%89%A9%E4%BD%93%E7%9A%84%E9%87%8D%E5%8A%9B%E5%88%86%E5%88%AB%E4%B8%BAA.20N%2C18N++B.10N%2C18N++C.18N%2C10N++D.20N%2C20N)
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如图9-4所示,动滑轮中2N,弹簧测力计的示数为10N,则拉力F和物体的重力分别为A.20N,18N B.10N,18N C.18N,10N D.20N,20N
如图9-4所示,动滑轮中2N,弹簧测力计的示数为10N,则拉力F和物体的重力分别为
A.20N,18N B.10N,18N C.18N,10N D.20N,20N
如图9-4所示,动滑轮中2N,弹簧测力计的示数为10N,则拉力F和物体的重力分别为A.20N,18N B.10N,18N C.18N,10N D.20N,20N
拉力F = 10N(因为一根绳子上任意位置的力大小相等)
因为F = (G物+G动)/2 所以G物 = 2F - G动 = 2×10N -2N = 18N
重力10+2-2=10n
拉力10+2-10=2n