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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 green plant is carrying out photosynthesis.
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उत्तर
Photosynthesis is taking place in a green plant; no work is being done here because there is no direct displacement.
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संबंधित प्रश्न
The moon is revolving around the earth in a circular path. How much work is done by the moon?
State the SI unit of work.
Each of the following statement describes a force acting. Which force is causing work to be done?
Draw a neat labeled diagram to show the direction of two forces acting on a body to produce rotation in it. Also mark the point about which rotation takes place.
Distinguish between work and power.
(a) Define power and name its unit.
(b) A girl weighting 50 kg climbs up 60 steps each of 20 cm height in 5 minutes. Calculate the power developed.
Give an example
Chemical energy changes to heat energy.
State whether work is done or not, by writing yes or no, in the following case:
A man pushes a wall.
