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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
Write an expression for the work done when a force is acting on an object in the direction of its displacement.
A car is running at a speed of 15 km h-1 while another similar car is moving at a speed of 45 km h-1. Find the ratio of their kinetic energies.
What is the work done against gravity when a body is moved horizontally along a frictionless surface?
An object is dropped from a height H. when is its
(i) P.E. maximum,
(ii) K.E. maximum,
(iii) P.E. = K.E.?
A boy pulls a box up to 10 m with a force of 5 kgf. Calculate the work done by him.
Calculate the work done when:
A 5 kg weight is lifted 10 m vertically. (g = 9.8 m/s2)
How long should an electric motor, of power 2 H.P. operate, so as to pump 5 m3 of water from a depth of 15m. [Take g = 10 N kg−1]
The weights of two bodies are 2.0 N and 2.0 kgf respectively what is the mass of each body?
If a ball is dropped on the sloping roof of a house, it acquires ______ and falls on the ground. That is the transformation of ______ energy into ______ energy takes place.
(kinetic, potential, motion)
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A donkey is carrying a load on its back.
