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A cubical block of side a and density `rho` slides over a fixed inclined plane with constant velocity v. There is a thin film of viscon fluid of thickness t between the plane and the block. Then the coefficeint of viscosity of the film will be A. `(3rhoag t)/(5v)`B. `(4rhoag t)/(5v)`C. `(rhoag t)/(5v)`D. None of these |
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Answer» Correct Answer - A Viscon force=`mg sin theta` `:. eta(a^2)v/t=mg sin37^(@)=3/5 mg` `(3)/(5) (a^(3)rho)g rArr :. eta =(3 rhoa g t)/(5v)` |
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