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प्रश्न
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A sailboat is moving due to wind energy.
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उत्तर
- Wind energy applies a force on the sailboat to push it in the forward direction.
- Therefore, there is a displacement in the boat in the direction of force.
- Hence, work is done by wind on the boat.
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संबंधित प्रश्न
Define 1 J of work.
Express joule in terms of erg.
A boy of mass 40 kg climbs up the stairs and reaches the roof at a height 8 m in 5 s. Calculate:
- the force of gravity acting on the boy,
- the work done by him against the force of gravity,
- the power spent by boy. (Take g = 10 m s-2)
Each of the following statement describes a force acting. Which force is causing work to be done?
Name five appliances or machines which use an electric motor.
What do you mean by a kilo joule?
Complete the following sentences:
Joule is the unit of .......
Complete the following sentences:
1 H.P. = ........ W.
Give an example
Light energy changes to electrical energy.
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
Food grains are getting dried in the sun.
