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प्रश्न
Give an example
Electrical energy changes of sound energy.
उत्तर
Electric bell
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संबंधित प्रश्न
When do we say that work is done?
Write the expression for work done by a force.
How is work related to energy?
Give reasons for the following. No work is done if a man is pushing against a wall.
A force of 30 N acts on a body and moves it through a distance of 5 m in the direction of force. Calculate the work done by the force.
State the law of conservation of energy.
The work done on an object does not depend on the :
A uniform circular motion is an accelerated motion. Justify it.
A boy does work when he pushes against a brick wall. (yes/no).
No work is done by a man moving on a horizontal road while carrying a box on his head. Explain.
Complete the following sentences:
The SI unit of work is ....... and of power is .......
State the energy changes which take place when A piece of magnesium wire is burnt in a jar of oxygen.
Give an example
Chemical energy changes to electrical energy.
State the amount of work done by an object when it moves in a circular path for one complete rotation. Give a reason to justify your answer.
Explain, why submarines are able to dive underwater as well as a sail on the surface of the water?
