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What should be the angle between the dir...

What should be the angle between the direction of motion of a body so that the work done is zero ?

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The correct Answer is:
`90^(@)`
NA
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LAKHMIR SINGH & MANJIT KAUR-WORK AND ENERGY-Exercise
  1. A boy tries to push a truck parked on the roadside. The truck does not...

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  2. The work done by a force acting obliquely is given by the formula : W ...

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  3. What should be the angle between the direction of motion of a body so ...

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  4. In which of the following case of work done by a force will be maximum...

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  5. How much work is done by the gravitational force of earth acting on a ...

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  6. A man is instructed to carry a package from the base camp at B to summ...

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  7. When a ball is thrown vertically upwards, its velocity goes on decreas...

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  8. A man X goes to the top of a building by a vertical spiral staircase....

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  9. When a ball is thrown inside a moving bus, does its kinetic energy dep...

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  10. A bullet of mass 15 g has a speed of 400 m/s. What is its kinetic ener...

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  11. COMMERCIAL UNIT OF ENERGY

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  12. One kilowatt-hour is equal to :

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  13. Name two units of power bigger than watt.

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  14. Define the term 'watt'.

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  15. One horse power is equal to

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  16. Name the physical quantity whose unit is watt.

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  17. What is the power of a body which is doing work at the rate of one jou...

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  18. A body does 1200 joules of work in 2 minutes. Calculate its power.

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  19. How many joules are there in one kilowatt-hour?

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  20. Name the quantity whose unit is : (a) kilowatt (b) kilowatt-hour

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