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Why are two propellers used in a helicop...

Why are two propellers used in a helicopter?

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JBD PUBLICATION-MOTION OF SYSTEM OF PARTICLES AND RIGID BODY-EXAMPLE
  1. A sphere is rolling without slippin on a horizontal surface and veloci...

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  2. A wheel stays in the upright position while rolling,whereas it falls f...

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  3. Why are two propellers used in a helicopter?

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  4. Consider a two - particle system with the particles having massesM1 a...

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  5. Starting from rest,a fan takes five seconds to attain the maximum sp...

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  6. A block of mass M is places in the top of a biggr block of mass 10 M a...

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  7. A wheel of radius 10 cm can rotate freely about its centre as shown in...

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  8. A wheel rotates with a constant acceleration of 2.0 rad//s^2 .If the w...

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  9. A wheel having moment of inertia 2 kg m^2 about its axis ,rotates at 5...

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  10. A string is wrapped around the rim of a wheel of moment of inertia 0.2...

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  11. A shell fired from a gun explodes into pieces in air .How is the centr...

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  12. A system consists of two particles of masses M and m(M>m) separated by...

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  13. The cap of the pen can be easily opened with the help of tw fingers th...

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  14. Derive expression for torque in cartesian co-ordinate system.

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  15. A spinninng top stands erect but a top which is not spinning falls.Why...

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  16. A disc spinning about its axis is placed lightly without an translatio...

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  17. A disc spinning clockwise about its axis with angular velocity omega0 ...

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  18. A disc spinning clockwise about its axis with angular velocity omega0 ...

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  19. A ring and disc have the same mass and radius.What is the ratio of the...

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  20. A constant torque acting on a uniform circular wheel changes its angul...

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