Advertisements
Advertisements
प्रश्न
A body does 20 J of work in 10 s. What is its power?
Advertisements
उत्तर
POWER = `"work done"/"time taken" = 20/10` = 2 watt
APPEARS IN
संबंधित प्रश्न
Why is a jack screw provided with a long arm?
Define 1 joule of energy.
State the SI unit of work.
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.
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.
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?
Name the material commonly used for the manufacturing of solar cells.
What should be the characteristic of a source of energy?
A ______ should act on an object.
