Advertisements
Advertisements
प्रश्न
Distinguish between work and power.
Advertisements
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
A coolie does no work against the force of gravity while carrying a luggage on a road.
.A man raises a box of mass 50kg to a height of 2m in 20s, while another man raises the same box to the same height in 50s. Compare:
(i) the work done, and
(ii) the power developed by them.
What is the condition for a force to do work on a body?
A boy throws a rubber ball vertically upwards. What type of work, positive or negative, is done : by the force applied by the boy?
(a) by the force applied by the boy?
(b) by the gravitational force of earth?
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.
State the energy changes which take place when Water stored in the dam is used to turn turbine in dynamo.
Give an example
Chemical energy changes to heat energy.
What is the difference between renewable and non-renewable resources?
A car is accelerated on a levelled road and attains a velocity 4 times of its initial velocity. In this process the potential energy of the car
