A ball of radius r and density p falls freely under gravity through a distance h before entering water. Velocity of ball does not change even on entering water. If viscosity of water is n, the value of h is given by

Question:

7.A ball of radius r and density p falls freely under gravity through a distance h before entering water. Velocity of ball does not change even on entering water. If viscosity of water is n, the value of h is given by

Options :

a) (2/9)r^2((1 - ρ)/η)g
b) (2/81)r^2((ρ - 1)/η)g
c) (2/81)r^4((ρ - 1)/η)^2g
d) (2/9)r^4((ρ - 1)/η)^2g

Answer :

c) (2/81)r^4((ρ – 1)/η)^2g

Answer Steps :

Solution :-

Step1 :-

Step2 :-

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Related Questions

The kinetic energy of a particle executing a linear SHM is 16 J, when it is in the mean position. If the amplitude is 25 cm, periodic time of the particle in second is (Mass of the particle = 51.2 g)

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