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Spherical balls of radius 'R' are fallin...

Spherical balls of radius 'R' are falling in a viscous fluid of viscosity `'eta'` with a velocity 'v'. The retarding viscous force acting on the spherical ball is

A

directly proportional to R but inversely propotional to

B

Directly proportional to both radius R and velocity v

C

inversely propotional to both radius R and velocity v

D

inversely propotional to R but directly propotional to velocity v

Text Solution

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The correct Answer is:
B
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ALLEN -ELASTICITY, SURFACE TENSION AND FLUID MECHANICS-Exercise 5 A (Previous year Questions)
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  9. A capillary tube (A) is dipped in water. Another identical tube (B) is...

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  10. A spherical solid ball of volume V is made of a material of density rh...

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  11. Two wires are made of the same material and have the same volume. Howe...

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  14. Work done in increasing the size of a soap bubble from a radius of 3cm...

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  15. Two mercury drops (each of radius r) merge to form a bigger drop. The ...

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  16. if a ball of steel (density rho=7.8 g//cm^(3)) attains a terminal velo...

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  17. A thin liquid film formed between a U-shaped wire and a light slider s...

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  18. There is a circular tube in a vertical plane. Two liquids which do not...

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  19. On heating water, bubbles being formed at the bottom of the vessel det...

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  20. If it takes 5 minutes to fill a 15 litre bucket from a water tap diame...

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