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प्रश्न
Relate 1 KWh (kilowatt hour) with joule.
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उत्तर
1 KWh = 1 KW × 1 h = 1000 W × 3600s = 36,00,000 J.
संबंधित प्रश्न
What are the S.I. and C.G.S units of work? How are they related? Establish the relationship.
A boy weighing 350 N climbs up 30 steps, each 20 cm high in 1 minute, Calculate:
- the work done and
- power spent.
A mechanic can open a nut by applying a force of 200 N while using a lever handle of 50 cm length. How long handle is required if he wants to open it by applying a force of only 50 N?
A man raises a box of mass 50 kg to a height of 2 m in 20s, while another man raises the same box to the same height in 50s. Calculated:
- the work done, and
- the power developed by each man. Take g = 10 N kg-1.
State the practical unit mainly used in mechanical engineering and write down its equivalent in watt.
A machine raises a load of 750 N through a height of 16 m in 5 seconds. Calculate the power at which the machine works.
State the C.G.S. unit of work. How it is related to its S.I. unit?
A coolie carries a load of 30 kgf through a distance of 500 m in 5 minutes while another coolie B carries the same load through the same distance in 10 minutes. Compare the
(i) work done, and
(ii) power developed. (Take: g = 10md−2)
A man weighing 700 N runs up a flight of 15 steps, each 20 cm high, in 5 seconds. Calculate the power of the man.
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).
