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प्रश्न
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उत्तर
Work done depends upon:
(i) the magnitude and direction of the applied force, and
(ii) the displacement it produces.
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संबंधित प्रश्न
The S.I. unit of work is
1 J = ______ calorie.
How much work is done when a force of 1 N moves a body through a distance of 1 m in its own direction?
How much work is done when a force of 2 N moves a body through a distance of 10 cm in the direction of force?
A boy of mass m climbs up a staircase of vertical height h.
- What is the work done by the boy against the force of gravity?
- What would have been the work done if he uses a lift in climbing the same vertical height?
A 100 W electric lamp emits energy in the form of light at the rate 10 J per second. What percentage of electric energy does the lamp transform into light energy?
Fill in the boxe to show the corresponding energy transformation.
A body of mass 60 kg has the momentum 3000 kgm/s-1. Calculate: the speed of the body.
The work done by the heart is 1 Joule per beat. Calculate the power of the heart if it beats 72 times in one.
An electric motor of power 100 W is used to drive the stirrer in a water bath. If 50% of the energy supplied to the motor is spent in stirring the water. Calculate the work done on the water in one minute.
