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प्रश्न
Give an example
Chemical energy changes to heat energy.
उत्तर
Candle flame
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संबंधित प्रश्न
Name a common device where a gear train is used
Work done = Force × ........................................
Define the term energy.
State two disadvantages of producing hydroelectricity.
What are the units of (a) work, and (b) energy?
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.
Is work done a scalar or a vector physical quantity?
A block of mass 20 kg is pulled up a slope (fig.12) with a constant speed by applying a force of 500 N parallel to the slope. A and B are initial and final positions of the block.
(a) Calculate the work done by the force in moving the block from A and B.
(b) Calculate the potential energy gained by the block.
State the energy changes which take place when An electric bulb glows when it is connected to a source of electric current.
In the following case write yes, if the work is being done and no if no work is being done.
A boy climbing up a staircase.
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A green plant is carrying out photosynthesis.
A body of mass 0.5 kg travels on straight line path with velocity v = (3x2 + 4) m/s. The net work done by the force during its displacement from x = 0 tox = 2 m is ______.
