Momentum and CollisionHard
Question
A cubical block of side ′a′ and density ′r′ 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 :
Options
A.
B.
C.
D.None of these
Solution
Viscous force = weight
ηA
= mg sin θ ⇒ ηa2
= a3ρg sin θ
⇒ η
ηA
= mg sin θ ⇒ ηa2= a3ρg sin θ⇒ η
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