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संबंधित प्रश्न
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.
State two disadvantages of producing hydroelectricity.
State the SI unit of work.
How much work is done when a force of 1 N moves a body through a distance of 1 m in its own direction?
A force of 50 N acts on a body and moves it a distance of 4 m on horizontal surface. Calculate the work done if the direction of force is at an angle of 60° to the horizontal surface.
A girl is carrying a school bag of 3 kg mass on her back and moves 200 m on a levelled road. If the value of g be 10 m/s2, the work done by the girl against the gravitational force will be :
Each of the following statement describes a force acting. Which force is causing work to be done?
The work done on an object does not depend on ______.
A cricket ball is thrown up from the earth's surface. What happens to its P.E.
(a) during the motion
(b) at the highest point?
Give an example
Electrical energy changes to heat energy.
