Advertisements
Advertisements
प्रश्न
Distinguish between work and power.
उत्तर १
Work is said to be done only when the applied force on a body makes the body move but power is the rate of doing work.
The SI unit of work is 'joules' and that of power is 'watt'.
उत्तर २
Work does not depend on time, while the power depends on time.
Power is the work done in unit time.
APPEARS IN
संबंधित प्रश्न
Explain briefly why the work done by a fielder when he takes a catch in a cricket match is negative.
A force of 30 N acts on a body and moves it through a distance of 5 m in the direction of force. Calculate the work done by the force.
When is work said to be done by a force?
In which of the following cases, is work being done?
(i) A man pushing a wall.
(ii) a coolie standing with a load of 12 kgf on his head.
(iii) A boy climbing up a staircase.
State the SI unit of work.
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°?
What is the work done against gravity when a body is moved horizontally along a frictionless surface?
Complete the following sentences:
Kilowatt is the unit of ....... and kWh is the unit of
A weight lifted a load of 200 kgf to a height of 2.5 m in 5 s. calculate: (i) the work done, and (ii) the power developed by him. Take g= 10 N kg-1.
An object is dropped from a height H. when is its
(i) P.E. maximum,
(ii) K.E. maximum,
(iii) P.E. = K.E.?
Fill in the boxe to show the corresponding energy transformation.
Is power a scalar or a vector quantity?
What are the advantages and disadvantages of using solar cells for producing electricity?
State whether work is done or not, by writing yes or no, in the following case:
A man pushes a wall.
