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Why does a flag (or ensign) flutter whe...

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

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When there is strong wind ,the kinetic energy of air at the end of flag is more and hence according to Bernoulli.s equation pressure is low .The pressure at support of flag is a high . So due to pressure difference flad flutters.
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When you are standstill holding a flag, the flag flutters in the direction of wind. When you start running the direction of fluttering of the flag changes to the direction of the wind relative to you. In all case a flag flutters in the direction of the wind relative to the flag. Holding a flag, when you run at 8 m/s due cast, the flag flutters in the north and when you run at 2m/s due south, the flag flutters in the northeast. If the wind velocity is unifoem and remain constant, find the wind velocity.

When you are standstill holding a flag, the flag flutters in the direction of wind. When you start running the direction of fluttering of the flag changes to the direction of the wind relative to you. In all case a flag flutters in the direction of the wind relative to the flag. Winds is blowing uniformly due north everywhere with velocity 12 m/s. A car mounted with a flag starts running towards cast. after 9s from starts the flag flutters in 53^(@) north of west and after 16 s from the start the flag flutters in 37^(@) north of west. (a) Find velocity of the car 9 s after it starts. (b) Find velocity of the car 16 s after it starts. (c) If the car maintains uniform acceleration, find acceleration of the car.

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KUMAR PRAKASHAN-MECHANICAL PROPERTIES OF FLUIDS -SECTION -C (Objective Questions) (VSQs)
  1. Why two rowing boats moving parallel to each other come closer (attrac...

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

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

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  4. Explain why roof of building flyout during stormy wind.

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  5. Why does an airplane run a certain length on the runway first before t...

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  6. Explain why bullets of gun are cylinder in shape ?

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  7. What is magnus effect ?

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  8. Give reason why mercury does not wet glass .

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  9. Why free surface of liquid tend to contract their surface ?

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  10. When drops of mercury are placed on a clean surfaces of glass , they m...

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  11. Give reason why are some insects able to walk on water surface ?

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  12. Why surface tension of antiseptics kept less ?

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  13. Explain why is hot soup more testy than the colder one ?

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  14. It is better to wash clothes in hot water than in cold water .Explain ...

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  15. Detergents is added to water for removing dirt from clothes.Explain .

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  16. Why colours and lubricating oil have less surface tension ?

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  17. Arrange the following liquids in increasing order of surface tension ....

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  18. If a liquid does wet the surface ,its angle of contact is acute or obt...

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  19. Liquid is stick to the glass then angle of contact for liquid glass wi...

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  20. On what factors does the value of angle of contact depend ?

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