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प्रश्न
उत्तर
If 1 joule of work is done in 1 second, the power is said to be 1 watt.
1 H.P. = 746 watt
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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.
Work done = Force × ........................................
How is work related to energy?
Express joule in terms of erg.
How much energy is gained by a box of mass 20 kg when a man, carrying the box waits for 5 minutes for a bus?
State two advantage of producing hydroelectricity.
Give one example each in which a force does (a) positive work (b) negative work, and (c) zero work.
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.
What should be the angle between the direction of force and the direction of motion of a body so that the work done is zero?
Ravi applied a force of 10 N and moved a book 30 cm in the direction of the force. How much was the work done by Ravi?
What is the work done against gravity when a body is moved horizontally along a frictionless surface?
Distinguish between work and power.
A cricket ball is thrown up from the earth's surface. What happens to its P.E.
(a) during the motion
(b) at the highest point?
A boy pulls a box up to 10 m with a force of 5 kgf. Calculate the work done by him.
Give an example
Chemical energy changes to electrical energy.
One labourer carried four pans of road metal through a distance of 100 metres. If he carries two pans of road metal through a 200 metre distance ______ work will be done.
State whether work is done or not, by writing yes or no, in the following case:
A man pushes a wall.
