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प्रश्न
Name the physical quantity associated with the 'rate of doing work'.
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उत्तर
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संबंधित 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 sailboat is moving due to wind energy.
A man lifts a mass of 20 kg to a height of 2.5 m. Assuming that the force of gravity on 1 kg mass is 10 N, find the work done by the man.
How much work is done when a body of mass m is raised to a height h above the ground?
A girl is carrying a school bag of 3 kg mass on her back and moves 200 m on a levelled road. If the value of g be 10 m/s2, the work done by the girl against the gravitational force will be :
Give two examples of couple actions in our daily life.
An electric motor drives a machine which lifts a mass of 4 kg through a height of 10 m in 5 s at a constant speed. Assuming g = 10 ms-2, calculate
(i) the amount of work done, (ii) the power of the machine.
State the energy changes which take place when A piece of magnesium wire is burnt in a jar of oxygen.
________ is said to be done when a force is acting on it.
