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 viscous fluid of thickness `t` between the plane and the block. Then the coefficient of viscosity of the thin film will be: (Acceleration due to gravity is g)

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

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

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

none of these

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