Advertisements
Advertisements
Question
1 kWh = ______ J.
Advertisements
Solution
1 kWh = 3.6 × 106 J
APPEARS IN
RELATED QUESTIONS
If the power of a motor is 100 kW, at what speed can it raise a load of 50,000 N?
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.
A satellite revolves around the earth in a circular orbit. What is the work done by the force of gravity? Give reason.
A body, when acted upon by a force of 10 kgf, gets displaced by 0.5 m. Calculate the work done by the force, when the displacement is (i) in the direction of force, (ii) at an angle of 60° with the force, and (iii) normal to the force. (g = 10 N kg-1)
Name the quality which is measured in Wh.
State the condition when the work done by a force is negative. Explain with the help of examples.
It takes 20 s for a person A of mass 50 kg to climb up the stairs, while another person B of same mass does the same in 15 s. Compare the power developed by the persons A and B.
State the condition when the work done by the force is negative.
State the C.G.S. unit of work. How it is related to its S.I. unit?
A force of 1 kgf displaces a body by a distance of 10 cm
(i) in direction of force,
(ii) normal to the force
(iii) at an angle of 60° to the direction of the force.
Calculate the amount of work done in each case. (Take: g = 9.8 ms−2 )
