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Find the minimum force required to drag ...

Find the minimum force required to drag a hard polythene plate of area `2 m^(2)` on a thin film of oil of thickness `0.25 cm` and `eta= 15` poise. Assume the speed of the plate is `10 cm s^(-1)`.

Text Solution

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`F=etaA(dy)/(dt)=etaAv/h=15xx2xx10^(4)xx10/0.25=1.2xx10^(7)` dyne
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