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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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MBD-WORK, ENERGY AND POWER-EXAMPLE
  1. The kinetic energy of a body becomes 4 times its initial value. The ne...

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  2. What are the conditions so that transfer of kinetic energy is maximum ...

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

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  4. A body is being raised to height h from the surface of earth. What is ...

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  5. A body is being raised to height h from the surface of earth. What is ...

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  6. Calculate the work done by a car against gravity in moving along a str...

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  7. Give an example of scalar product.

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  8. Name the physical quantity which is expressed as product of force and ...

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  9. What is te relation between joule and kg m?

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  10. Name the physical quantity which is expressed as product of force and ...

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  11. Does the work done in raising a box on a platform depend upon how fast...

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  12. With what type of forces, potential energy is associated?

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  13. Dot product of two vectors obey law.

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  14. Since work is a scalar quantity, can it have negative value?

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  15. Fill in the blanks: is the capacity of doing work.

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  16. Work can be negative or Zero.

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  17. The kinetic energy of a body is always .

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

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  19. The collision in one dimension is also known as collisions.

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  20. What is work? What is it equal to?

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