A cubical block of side a and density rh...

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

`(rhoa"gt"sintheta)/(v)`

`(rho"gt"costheta)/(v)`

`(v)/(rho"gt"sintheta)`

none of these

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