The velocity of a small ball of mass M and density ρ , when dropped in a container filled with glycerine becomes constant after some time. If the density of glycerine is ρ 2 , then the viscous force acting on the ball will be:

Question

The velocity of a small ball of mass M and density ρ , when dropped in a container filled with glycerine becomes constant after some time. If the density of glycerine is ρ 2 , then the viscous force acting on the ball will be:, 3 M g 2, M g, 1 2 M g, 2 M g

MARKS App · Accepted Answer

When velocity becomes constant then, F v + F b = M g F v = M g - F b = V ρ b g - V ρ g g = V g ρ - ρ 2 = V g ρ 2 = ( V ρ ) g 2 = M g 2

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