Advertisements
Advertisements
Question
Advertisements
Solution
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
RELATED QUESTIONS
Work done by a boy depends on the time in which he does work.
The moon is revolving around the earth in a circular path. How much work is done by the moon?
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 happens to the work done when the dispacement of body is at right angles to the direction of force acting on it? Explain your answer.
Can work done be zero even if force acts on the body?
A woman pulls a bucket of water of total mass 5 kg from a well which is 10 s. calculate the power used by her.
Fill in the boxe to show the corresponding energy transformation.

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 ______.
