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प्रश्न
Observe the picture and put a tick (✓) if work is done and put a cross (x) if work is not done.
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उत्तर
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संबंधित प्रश्न
Fill in the blank
An electric fan converts electrical energy into ______ energy.
Select the correct alternatives
The correct statement is
State the unit of energy and define it.
What do you mean by conservation of mechanical energy? State the condition when does it hold.
Tick the most appropriate answer.
The force applied on a machine to do work is called the
Answer the following in a word or two or in a sentence.
Write the formula for calculating the efficiency of a machine.
Name the quantity whose unit is :
(a) kilowatt
(b) kilowatt-hour
If the energy of a ball falling from a height of 10 metres is reduced by 40%, how high will it rebound?
Which one of the following requires wind energy?
A ball is dropped from a height of 10 m. If the energy of the ball reduces by 40% after striking the ground, how much high can the ball bounce back? (g = 10 m s–2)
