A thin square plate of side 5cm is suspended vertically from a balance so that lower side just dipsinto water with side parallel to surface. When the plate is clean (theta= 0^@ ), it appears to weigh 0.044N. But when the plate is greasy ( theta= 180^@ ), it appears to weigh 0.03N. The surface tension of water is sigma (10^(-2) Nm^(-1) ). Find sigma

A thin square plate of side 5cm is suspended vertically from a balance

1.	A thin square plate of side 5cm is suspended vertically from a balance so that lower side just dipsinto water with side parallel to surface. When the plate is clean (theta= 0^@ ), it appears to weigh 0.044N. But when the plate is greasy ( theta= 180^@ ), it appears to weigh 0.03N. The surface tension of water is sigma (10^(-2) Nm^(-1) ). Find sigma
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