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
Define 1 watt of power.
A battery lights a bulb. Describe the energy changes involved in the process.
An electric heater is rated 1500 W. How much energy does it use in 10 hours?
A load of 100 kg is pulled up by 5 m. Calculate the work done. (g = 9.8 m/s2)
Calculate the work done by the brakes of a car of mass 1000 kg when its speed is reduced from 20 m/s to 10 m/s?
Name the physical quantity whose unit is watt.
The power output of an engine is 3kW. How much work does the engine do in 20 s?
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.
In loading a truck, a man lifts boxes of 100 N each through a height of 1.5 m.
How much work does he do in lifting one box?
