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  5. Systems Of Particles & Rotational Motion / कणों के निकाय तथा घूर्णी गति

11th Class Physics Systems Of Particles & Rotational Motion / कणों के निकाय तथा घूर्णी गति Question Bank Systems Of Particles & Rotational Motion Conceptual Problems

  • question_answer
    Why there are two propellers in a helicopter?

    Answer:

                    If there were only one propeller in the helicopter then, due to conservation of angular momentum, the helicopter itself would have turned in the opposite direction.


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