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Why there two propellers in a helicopter...

Why there two propellers in a helicopter ?

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Due to conservation of angular momentum.
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CBSE COMPLEMENTARY MATERIAL-ROTATIONAL MOTION -MULTIPLE CHOICE QUESTIONS
  1. Why there two propellers in a helicopter ?

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  2. For which of the following does the centre of mass lie outside the bod...

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  3. When a disc rotates with uniform angular velocity, which of the follow...

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  4. Two identical particles move towards each other with velocity 2v and v...

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  5. A circular disc of radius R is removed from a bigger circular d...

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  6. Distance of the centre of mass of a solid uniform cone from its vertex...

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  7. Angular momentum of the particle rotating with a central force is con...

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  8. Four point masses, each of value m, are placed at the corners of a squ...

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  9. A couple is acting on a two particle system. The resultant motion will...

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  10. Dimensions of angular momentum are

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  11. Moment of inertia of a body does not depend on

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  12. One circular ring and one circular disc, both are having the same mass...

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  13. What is the ratio of the moments of inertia of two rings radii r and n...

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  14. Two rings of radius R and nR made of same material have the ratio of m...

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  15. The moment of inertia of a ring about one of its diameters is I.What w...

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  16. If a person standing on a rotating disc stretches out his hands, the a...

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  17. A solid sphere is rolling without slipping on a horizontal plane. The ...

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  18. A solid sphere of radius 'r' is rolling with velocity V on a smooth pl...

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  19. Two bodies have their moments of inertia I and 2 I respectively about ...

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  20. An inclined plane makes an angle 30° with the horizontal. A solid sphe...

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  21. The motion of planets in the solar system is an exmaple of the conserv...

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