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प्रश्न
Complete the following sentences:
Kilowatt is the unit of ....... and kWh is the unit of
उत्तर
Kilowatt is the unit of power and kWh is the unit of energy
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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.
The energy of a body is its capacity to do .........
No work is done by a force if the body
A boy weighing 25 kgf climbs up from the first floor at height 3 m above the ground to the third floor at height 9m above the ground. What will be the increase in his gravitational potential energy? (Take g = 10 N kg -1)
When is the work done by a force on a body : (a) positive, (b) negative, and (c) zero?
The work done on an object does not depend on ______.
Name the physical quantity whose SI unit is Nm.
Is the motion of moon around the earth in circular path an accelerated motion?
Complete the following sentences:
Joule is the unit of .......
A machine raises a load of 750 N through a height of 16 m in 5s. calculate:
(i) work done by machine,
(ii) power at which the machine works.
If an electric bulb of 100 watt is lighted for 2 hours, how much electric energy would be consumed?
A block of mass 20 kg is pulled up a slope (fig.12) with a constant speed by applying a force of 500 N parallel to the slope. A and B are initial and final positions of the block.
(a) Calculate the work done by the force in moving the block from A and B.
(b) Calculate the potential energy gained by the block.
State the energy changes which take place when An electric bulb glows when it is connected to a source of electric current.
In the following case write yes, if the work is being done and no if no work is being done.
A boy climbing up a staircase.
A force is applied on a body of mass 20 kg moving with a velocity of 40 ms−1. The body attains a velocity of 50 ms−1 in 2 seconds. Calculate the work done by the body.
The weights of two bodies are 2.0 N and 2.0 kgf respectively what is the mass of each body?
A ______ should act on an object.
A body of mass 0.5 kg travels on straight line path with velocity v = (3x2 + 4) m/s. The net work done by the force during its displacement from x = 0 tox = 2 m is ______.
State whether work is done or not, by writing yes or no, in the following case:
A man pushes a wall.
