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प्रश्न
What do you mean by a kilo joule?
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उत्तर
A kilojoule of work is said to done when a force of 1 newton displaces a body through 1000 metres in its own direction.
1 kJ = 103 joules
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संबंधित प्रश्न
When do we say that work is done?
Work done by a boy depends on the time in which he does work.
Work done = Force × ........................................
A boy of weight 40 kgf climbs up the 15 steps, each 15 cm high in 10 s and a girl of weight 20 kgf does the same in 5 s. Compare:
- the work done, and
- the power developed by them. Take g = 10 N kg-1.
Fill in the blank with suitable word :
The work done on a body moving in a circular path is __________
When is the work done by a force on a body : (a) positive, (b) negative, and (c) zero?
A girl weighing 400 N climbs a vertical ladder. If the value of g be 10 m s−2, the work by her after climbing 2 m will be :
A man climbs a slope and another walks same distance on level road. Which of the two expends more energy and why?
A bucketful of water is to be drawn from a well ______ will be done when a ______ is applied to do this because there will be a ______ of water.
(displacement, work, force)
