Advertisements
Advertisements
प्रश्न
Advertisements
उत्तर
Horse power is the unit of power. The horsepower used for electrical machines is defined as exactly 746 watt.
Classically, a horse exerting 1 H.P. can raise 330 pounds of coal 100 feet in a minutes, or 33 pounds of coal 1,000 feet in one minute, or, 1,000 pounds 33 feet in one minute.
APPEARS IN
संबंधित प्रश्न
Work done by a boy depends on the time in which he does work.
The S.I. unit of energy is .............
A boy of mass 40 kg climbs up the stairs and reaches the roof at a height 8 m in 5 s. Calculate:
- the force of gravity acting on the boy,
- the work done by him against the force of gravity,
- the power spent by boy. (Take g = 10 m s-2)
Write the formula for work done on a body when the body moves at an angle to the direction of force. Give the meaning of each symbol used.
A girl weighing 400 N climbs a vertical ladder. If the value of g be 10 m s−2, the work by her after climbing 2 m will be :
Why does a spanner have a long handle?
Define 'joule'.
On what factors does the work done by a force depend?
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?
