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संबंधित प्रश्न
Define 1 joule of 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.
The power of a motor is 40 kW. At what speed can the motor raise a load of 20,000 N?
How much work is done when a force of 1 N moves a body through a distance of 1 m in its own direction?
Define the term 'work'. Write the formula for the work done on a body when a force acts on the body in the direction of its displacement. Give the meaning of each symbol which occurs in the formula.
Is work done a scalar or a vector physical quantity?
State the energy changes which take place when A stone dropped from the top of a cliff reaches the ground after some time.
What is the difference between renewable and non-renewable resources?
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A wind-mill is lifting water from a well.
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.
