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Why not rain drops do not posses greater...

Why not rain drops do not posses greater velocity than some velocity ?

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Since the rain drop freely falling under the gravitational force .The other force is the air resistance exerted opposite to its motion .As the velocity increases resultant force on it decreases if a resultant force for certain velocity
`[F_(V)=(4)/(5)pir^(3)(rho-sigma)g-sigmapietarv]` becomes zero then its velocity becomes contant which is known as terminal velocity From now velocity of drop does not increases.
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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 ?

Assertion: Average speed of a particle in a given time interval is never less than the magnitude of the average velocity. Reason: The magnitude of the velocity (instantaneous velocity) of a particle is equal to its speed.

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 ?

A stone is dropped from the top of tower. If its velocity at the mid point of height of tower is 10ms^(-1), then the height of a tower is ..... (g = 10 ms^(-2))

A planet in a distant solar system is 10 times more massive than the earth and its radius is 10 times smaller. Given that the escape velocity from the earth is 11kms^(-1) , the escape velocity from the surface of the planet would be .......

KUMAR PRAKASHAN-MECHANICAL PROPERTIES OF FLUIDS -SECTION -C (Objective Questions) (VSQs)
  1. The flow of water of river at banks is slow than at middle of river ....

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  2. Which falls faster , big rain drops or small rain drops ?

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  3. Why not rain drops do not posses greater velocity than some velocity ?

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  4. Why is dust particles settled down on floor in a closed room ?

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  5. Give an illustration of steady flow.

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  6. Explain Reynolds Number.

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  7. What is the value of Reynolds number for streamline flow ?

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  8. What is the value of Reynolds number for unsteady flow ?

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  9. What is the value of Reynold's number for turbulent flow ?

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  10. What is inertial force ?

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  11. Which of the ratio of forces represents the Reynolds number Re ?

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  12. Why does fluid flow faster at a narrow tube ?

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  13. Which fundamental law forms the basis of equation of continuity ?

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  14. Which types of energies are present in streamline flow of fluid ?

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  15. Which fundamental law forms the basis of Bernoullis equation ?

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  16. Write Bernoulli's principle in word.

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  17. Why is it dangerous to stand on the edge of platform near the line ,wh...

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  18. Why two rowing boats moving parallel to each other come closer (attrac...

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  19. When a fluid passes through a constricted part of a pipe ,what happens...

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  20. Why does a flag (or ensign) flutter when there is strong wind ?

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