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प्रश्न
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उत्तर
Four different forms of energy:
(i) Solar energy
(ii) Mechanical energy
(iii) Wind energy
(iv) Nuclear energy
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संबंधित प्रश्न
A coolie does no work against the force of gravity while carrying a luggage on a road.
Fill in the blank with suitable word :
The work done on a body moving in a circular path is __________
Fill in the blank with suitable word :
1 joule is the work done when a force of 1 __________ moves an object through a distance of one __________ in the direction of __________.
How much work is done by the gravitational force of earth acting on a satellite moving around it in a circular path? Give reason for your answer.
Can work done be zero even if force acts on the body?
Give an example
Chemical energy changes to heat energy.
What is the difference between renewable and non-renewable resources?
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.
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.
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)
