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Why should a helicopter necessarily have...

Why should a helicopter necessarily have two propellers ?

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If the helicopter had only one propeller, then due to conservation of angular momentum, the helicopter itself would turn in the opposite direction. Hence, the helicopter should necessarily have two propellers
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VGS PUBLICATION-BRILLIANT-SYSTEM OF PARTICLES AND ROTATIONAL MOTION -PROBLEMS
  1. Why should a helicopter necessarily have two propellers ?

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  2. Show that a.(bxxc) is equal in magnitude to the volume of the parallel...

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  3. A rope of negligible mass is wound round a hollow cylinder of mass 3 k...

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  4. A coin is kept a distance of 10 cm from the centre of a circular turn ...

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  5. Find the torque of a force 7veci+ 3vecj - 5veck about the origin. Th...

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  6. Particles of masses 1g, 28, 3g ..., 100g are kept at the marks 1 cm, 2...

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  7. Calculate the moment of inertia of a fly wheel, if its angular velocit...

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  8. Three particles each of mass 100 g are placed at the vertices of an eq...

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  9. Four particles each of mass 100g are placed at the corners of a square...

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  10. Two uniform circular discs, each of mass 1 kg and radius 20 cm, are ke...

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  11. Four spheres each diameter 2a and mass 'm' are placed with their centr...

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  12. To maintain a rotor at a uniform angular speed or 200 rad s^(-1) an e...

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  13. A metre stick is balanced on a knife edge at its centre. When two coin...

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  14. Determine the kinetic energy of a circular disc rotating with a speed ...

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  15. Two particles, each of mass m and speed u, travel in opposite directio...

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  16. The moment of inertia of a flywheel making 300 revolutions per minute ...

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  17. Calculate the moment of inertia of a fly wheel, if its angular velocit...

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  18. Find the centre of mass of three particles at the vertices of an equil...

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