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The velocity of falling rain drop attain...

The velocity of falling rain drop attain limited value bacause of

A

surface tension

B

upthrust due to air

C

viscous force exerted by air

D

air current

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The correct Answer is:
C
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By the term velocity of rain, we mean velocity with which raindrops fall relative to the ground. In absence of wind, raindrops fall vertically and in presence of wind raindrops fall obliqucly. Moreover raindrops acquire a constant terminal velocity due air resistance very quickly as they fall toward the carth. A moving man relative to himself observes an altered velocity of raindrops. Which is known as velocity of rain relative to the man. It is given by the following equation. vec(v)_(rm)=vec(v)_(r)-vec(v)_(m) A standstill man relative to himself observes rain falling with velocity, which is equal to velocity of the raindrops relative to the ground. To protect himself a man should his umbrella against velocity of raindrops relative to himself as shown in the following figure. Rain is falling vertically with velocity 80 cm/s. (a) How should you hold your umbrella ? (b) You start walking towards the east with velocity 60 cm/s. How should you hold umbrella ? (c) You are walking towards the west with velocity 60 cm/s. How should you hold your umbrella ? (d) You are walking towards the north with velocity 60 cm/s. How should you hold your umbrella? (e) You are walking towards the south with velocity 80 cm/s. How should you hold your umbrella ?

By the term velocity of rain, we mean velocity with which raindrops fall relative to the ground. In absence of wind, raindrops fall vertically and in presence of wind raindrops fall obliqucly. Moreover raindrops acquire a constant terminal velocity due air resistance very quickly as they fall toward the carth. A moving man relative to himself observes an altered velocity of raindrops. Which is known as velocity of rain relative to the man. It is given by the following equation. vec(v)_(rm)=vec(v)_(r)-vec(v)_(m) A standstill man relative to himself observes rain falling with velocity, which is equal to velocity of the raindrops relative to the ground. To protect himself a man should his umbrella against velocity of raindrops relative to himself as shown in the following figure. When you are standstill in rain, you have to hold umbrella vertically to protect yourself. (a) When you walk with velocity 90 cm/s, you have to hold your umbrella at 53^(@) above the horizontal. What is velocity of the raindrops relative to the ground and relative to you ? (b) If you walk with speed 160 cm/s, how should you hold your umbrella ?

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ALLEN -ELASTICITY, SURFACE TENSION AND FLUID MECHANICS-Exercise 1 (Fluid Statics)
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  4. An aeroplane of mass 3xx10^(4)kg and total wing area of 120 m^(2) is i...

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  5. One end of a horizontal pipe is closed with the help of a velve and th...

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  6. A man can swim with a speed of 4.0 km/h in still water . How long doe...

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  7. A U-tube of small and uniform cross section contains water of total le...

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  8. 16cm^(3) of water flows per second through a capillary tube of radius ...

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  9. The water level on a tank is 5m high. There is a hole of 1 cm^(2) cro...

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  10. In the following fig., the flow of liquid through a horizontal pipe is...

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  11. The diagram (figure) shows a venturimeter, through which water is flow...

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  12. Water contained in a tank flows through an orifice of a diameter 2 cm ...

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  13. More viscous oil is used in summer than in winterr in motors due to

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  14. With increase in temperature the viscosity of

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  15. A rain drop of radius 0.3 mm has a terminal velocity in air 1m/s. the ...

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  16. Two liquids of densities d(1) and d(2) are flowing in identical capill...

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  17. The velocity of falling rain drop attain limited value bacause of

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  18. The rate of flow of liquid through a capillary tube in an experiment t...

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  19. A copper ball of radius r travels with a uniform speed v in a viscous ...

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  20. Two drops of the same radius are falling through air with a steady vel...

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