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16. Spherical balls of radius ‘r’ are falling in a viscous fluid of viscosity

‘η‘ with a velocity ‘v‘. The retarding viscous force acting on the spherical ball is

(a) Inversely proportional to ‘r‘ but directly proportional to velocity ‘v‘

(b) Directly proportional to both radius ‘r‘ and velocity ‘v‘

(c) Inversely proportional to both radius ‘r‘ and velocity ‘v‘

(d) Directly proportional to ‘r‘ but inversely proportional to ‘v‘

Answer-b

(7)

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PrevPrevious15. A square plate of 0.1 m side moves parallel to a second plate with a velocity of 0.1 m/s, both plates being immersed in water. If the viscous force is 0.002 N and the coefficient of viscosity is 0.01 poise, distance between the plates in m is

Next17. A small sphere of mass m is dropped from a great height. After it has fallen 100 m, it has attained its terminal velocity and continues to fall at that speed. The work done by air friction against the sphere during the first 100 m of fall isNext

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