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प्रश्न
State the energy changes which take place when A toy car with a wound spring moves on ground.
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उत्तर
P.E (Wound spring) to K.E. (motion)
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संबंधित प्रश्न
Define the term energy.
When is work said to be done by a force?
A machine raises a load of 750 N through a height of 16 m in 5 s. calculate:
- energy spent by machine,
- power at which the machine works.
When do we say that work is done? Write the formula for the work done by a body in moving up against gravity. Give the meaning of each symbol which occurs in it.
Name five appliances or machines which use an electric motor.
Complete the following sentences:
1 H.P. = ........ W.
Give an example
Chemical 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.
