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Why is electrical power required at all ...

Why is electrical power required at all when the elevator is descending? Why should there be a limit on the number of passengers in this case?

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JBD PUBLICATION-WORK,ENERGY AND POWER-EXAMPLE
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  2. A rough incline plane is placed on a cart moving with a constnat veloc...

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  3. Why is electrical power required at all when the elevator is descendin...

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  4. Calculate the power of a crane in watts,which lifts a mass of 100 kg t...

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  5. A body falls towards earth in air. Will its total mechanical energy be...

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  6. What is a collision?

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  7. If two bodies collide and one is initially at rest, is it possible fo...

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  8. If two bodies collide and one is initially at rest, is it possible fo...

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  9. Distinguish between a head on and an oblique collision.

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  10. Is it possible to have a collision in which the whole of KE is lost?

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  11. What conclusion can you draw about the masses of projectile and target...

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  12. What conclusion can you draw about the masses of projectile and target...

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  13. What conclusion can you draw about the masses of projectile and target...

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  14. The bob A of a pendulum released from 30^@ to the vertical hits anothe...

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  15. A molecule in a gas container hits a horizontal wall with speed 200 m ...

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  16. Answer carefully, with reasons :-In an elastic collision of two billia...

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  17. During inelastic collision between two bodies, which of the following ...

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  18. The bob A of a pendulum released from horizontal to the vertical hits ...

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  19. The bob A of a pendulum released from horizontal to the vertical hits ...

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  20. A throwing mud on the wall is one of the examples of a perfectly inela...

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