Advertisements
Advertisements
Question
How is the unit horsepower related to the S.I. unit of power?
Advertisements
Solution
1 house power (hp) = 746 watts
APPEARS IN
RELATED QUESTIONS
A boy weighing 40 kgf climbs up a stair of 30 steps each 20 cm high in 4 minutes and a girl weighing 30 kgf does the same in 3 minutes. Compare:
- The work done by them.
- The power developed by them.
State and define the S.I. unit of work.
Name the quality which is measured in kWh.
Name the force needed for circular motion. What is the direction of the force?
A boy takes 3 minutes to lift a 20 litre water bucket from a 20 m deep well, while his father does it in 2 minutes. Compare:
- the work, and
- power developed by them.
In the following case write yes, if the work is being done and no if no work is being done.
A man moving on the rough ground.
State two conditions for work to be done.
Calculate the work done when:
A car is moved on a rough road through 30 m against a frictional resistance of 75 N.
The world record for weight lifting was held by Sergei Didyk of the USSR. He lifted 261 kg to a height of 2.3 m in 4s; find:
(a) Weight lifted by him
(b) Work done by him
(c) Power developed by him. (g = 10m/s2)
A boy weighing 50 kgf climbs up from the first floor at a height of 3 m above the ground to the third floor at a height of 9 m above the ground. What will be the increase in his gravitational potential energy? (Take g = 10 N kg-1).
