Advertisements
Advertisements
प्रश्न
Advertisements
उत्तर
(i) work done depends on the displacement, now, vertical distance travelled by A and B is same, hence ratio of wok done by them is 1 : 1.
(ii) Power = `"work done"/"time taken"`
`"P"_"A"/"P"_"E" = 1/1 xx 15/20 = 3/4`
The required ratio is 3 : 4.
APPEARS IN
संबंधित प्रश्न
Work is said to be done by a forte only when ................
A man lifts a mass of 20 kg to a height of 2.5 m. Assuming that the force of gravity on 1 kg mass is 10 N, find the work done by the man.
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.
What do you understand by 'potential energy' and 'Kinetic energy'? Give three examples of each to illustrate your answer.
State the energy changes which take place when An electric bulb glows when it is connected to a source of electric current.
State the energy changes which take place when A toy car with a wound spring moves on ground.
A water pump raises 50 kg of water through a height of 25 m in 5s. Calculate the power supplied by the pump (Take: g = 10 N kg−1).
What is power? How do you differentiate kilowatt from kilowatt-hour? The Jog Falls in Karnataka state are nearly 20 m high. 2000 tonnes of waterfalls from it in a minute. Calculate the equivalent power if all this energy can be utilized? (g = 10 m s–2)
A body of mass 0.5 kg travels on straight line path with velocity v = (3x2 + 4) m/s. The net work done by the force during its displacement from x = 0 tox = 2 m is ______.
