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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.
संबंधित प्रश्न
A force of 7 N acts on an object. The displacement is, say 8 m, in the direction of the force (see the given figure). Let us take it that the force acts on the object through the displacement. What is the work done in this case?
Define the term energy.
MULTIPLE CHOICE TYPE
In an electric cell which in use, the change in energy is from:
Define 1 joule of work.
What is the work done when the object acted upon by a force remains at rest?
What do you mean by a kilo joule?
A bullet is of mass 'm' g and is moving with a velocity 'v' m/s. Find the kinetic energy of the bullet when
(a) The mass is doubled,
(b) The velocity is tripled.
Why is less effort needed to lift a load over an inclined plane as compared to lifting the load directly?
Name the material commonly used for the manufacturing of solar cells.
