Advertisements
Advertisements
प्रश्न
A body does 1200 joules of work in 2 minutes. Calculate its power.
Advertisements
उत्तर
Work done (W) = 1200 J
Time taken (t) = 120 s
We can calculate the power of the body as,
Power = `"Work done"/"Time"`
So ,
Power = `1200/120` W
= 10 W
So, the power of this appliance is 10 W.
APPEARS IN
संबंधित प्रश्न
A person holds a bundle of hay over his head for 30 minutes and gets tired. Has he done some work or not? Justify your answer.
An electric heater is rated 1500 W. How much energy does it use in 10 hours?
A body of mass 100 kg is lifted up by 10 m. Find :
(i) the amount of work done
(ii) potential energy of the body at that height (value of g = 10 m/s2)
Name the physical quantity whose unit is watt.
What is the power of a body which is doing work at the rate of one joule per second?
A man weighing 500 N carried a load of 100 N up a flight of stairs 4 m high in 5 seconds. What is the power?
A car of weight 20000 N climbs up a hill at a steady speed of 8 m/s, gaining a height of 120 m is 100 s. Calculate : power of engine of car.
Define power. Give the SI unit of power.
A boy weighing 40 kg carries a box weighing 20 kg to the top of a building 15 m high in 25 seconds. Calculate the power. (g = 10 m/s2)
In loading a truck, a man lifts boxes of 100 N each through a height of 1.5 m.
If the man lifts 4 boxes per minute, at what power is he working?
(g = 10 m s−2)
