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प्रश्न
Complete the following sentences:
The SI unit of work is ....... and of power is .......
उत्तर
The SI unit of work is joule and of power is watt
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संबंधित प्रश्न
A body of mass 5 kg falls from a height of 10 m to 4 m. Calculate:
The loss in potential energy of the body,
Fill in the blank with suitable word :
Work is measured as a product of __________ and __________
If the work done by a force in moving an object through a distance of 20 cm is 24.2 J, what is the magnitude of the force?
In which of the following case the work done by a force will be maximum : when the angle between the direction of force and direction of motion is 0° or 90°?
Each of the following statement describes a force acting. Which force is causing work to be done?
Name the physical quantity whose SI unit is Nm.
Nm is the unit of .......
A boy of mass m climbs up a staircase of vertical height h.
- What is the work done by the boy against the force of gravity?
- What would have been the work done if he uses a lift in climbing the same vertical height?
An object is dropped from a height H. when is its
(i) P.E. maximum,
(ii) K.E. maximum,
(iii) P.E. = K.E.?
State the energy changes which take place when Water stored in the dam is used to turn turbine in dynamo.
State the energy changes which take place when A stone dropped from the top of a cliff reaches the ground after some time.
What should be the characteristic of a source of energy?
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.
Work done by this force at any instant is ______.
