大学物理
把一长为2cm的钢针轻放在液体表面上并使钢针浮着,若液体的表面张力系数为0.02N/m,那么钢针的重量为(D)A,0.0002NB,0.0001NC,0.0004ND,0...
把一长为2 cm的钢针轻放在液体表面上并使钢针浮着,若液体的表面张力系数为0.02N/m,那么钢针的重量为(D )
A,0.0002N B,0.0001N C,0.0004N D,0.0008N E,0.0016N
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A,0.0002N B,0.0001N C,0.0004N D,0.0008N E,0.0016N
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针左右两个边界2cm×2=0.04m,乘以表面张力系数为0.02N/m。
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它受到的表面张力就是针的重力吗?
追答
其实没有考虑浮力,但浮力是浮不起针的,影响较小。
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