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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
When do we say that work is done?
Derive a relationship between S.I. and C.C.S. unit of work
State the S.I. unit of energy.
A weight lifter lifted a load of 200 kgf to a height of 2.5 m in 5 s. Calculate:
- the work done, and
- the power developed by him. Take g = 10 N kg-1
A boy of weight 40 kgf climbs up the 15 steps, each 15 cm high in 10 s and a girl of weight 20 kgf does the same in 5 s. Compare:
- the work done, and
- the power developed by them. Take g = 10 N kg-1.
MULTIPLE CHOICE TYPE
In an electric cell which in use, the change in energy is from:
Fill in the blank with suitable word :
Work is measured as a product of __________ and __________
Fill in the blank with suitable word :
The work done on a body moving in a circular path is __________
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?
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.
When you move upstairs, do you perform some work?
On what factors does the work done by a force depend?
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?
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.
An object is dropped from a height H. when is its
(i) P.E. maximum,
(ii) K.E. maximum,
(iii) P.E. = K.E.?
Give an example
Chemical energy changes to heat energy.
State larger units of power.
A force can cause an object to change its ______.
