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प्रश्न
State the SI unit of work.
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उत्तर
Joule is the SI unit of work. It is denoted by ‘J.
संबंधित प्रश्न
Write an expression for the work done when a force is acting on an object in the direction of its displacement.
1 J = ______ calorie.
Is it possible that a force is acting on a body but still the work done is zero? Explain giving one example.
Write the formula for work done on a body when the body moves at an angle to the direction of force. Give the meaning of each symbol used.
Give one example in which a force does zero work.
A boy tries to push a truck parked on the roadside. The truck does not move at all. Another boy pushes a bicycle. The bicycle moves through a certain distance. In which case was the work done more : on the trick or on the bicycle? Give a reason to support your answer.
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 :
Is the motion of moon around the earth in circular path an accelerated motion?
Complete the following sentences:
The SI unit of work is ....... and of power is .......
Complete the following sentences:
Joule is the unit of .......
A woman pulls a bucket of water of total mass 5 kg from a well which is 10 s. calculate the power used by her.
Calculate the amount of work done by a child carrying a bag of 20 kg when he moves a distance of 40 m in
(a) Vertical direction, and
(b) Horizontal direction
Give an example
Electrical energy changes of sound energy.
Name two places in India where electricity is generated from nuclear power plants.
The work done by the heart is 1 Joule per beat. Calculate the power of the heart if it beats 72 times in one.
What is work?
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
Food grains are getting dried in the sun.
