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प्रश्न
How many joules are there in 1 mega joule?
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उत्तर
1 MJ = 106 joules
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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.
Define work.
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.
Explain by an example that a body may possess energy even when it is not in motion.
What is the relationship between Nm and dyne cm?
No work is done by a man moving on a horizontal road while carrying a box on his head. Explain.
What do you understand by the term energy? Is energy a scalar or vector? How is the energy possessed by a body measured?
A water pump raises 50 kg of water through a height of 25 m in 5s. Calculate the power supplied by the pump (Take: g = 10 N kg−1).
What is power? How do you differentiate kilowatt from kilowatt-hour? The Jog Falls in Karnataka state are nearly 20 m high. 2000 tonnes of waterfalls from it in a minute. Calculate the equivalent power if all this energy can be utilized? (g = 10 m s–2)
