Advertisements
Advertisements
प्रश्न
Name the physical quantity whose unit is watt.
Advertisements
उत्तर
Power is the physical quantity whose SI unit is watt. Power is defined as rate of doing work.
APPEARS IN
संबंधित प्रश्न
A lamp consumes 1000 J of electrical energy in 10 s. What is its power?
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 does 1200 joules of work in 2 minutes. Calculate its power.
Fill in the blank with suitable word :
Power is the rate of doing ___________.
A trolley is pushed along a road with a force of 400 N through a distance of 60 m in 1 minute. Calculate the power developed.
The power output of an engine is 3kW. How much work does the engine do in 20 s?
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)
An electric motor raises a load of 0.2 kg, at a constant speed, through a vertical distance of 3.0 m in 2 s. If the acceleration of free fall is 10 m/s2, the power in W developed by the motor in raising the load is :
How is the power related to the speed at which a body can be lifted? How many kilograms will a man working at the power of 100 W, be able to lift at a constant speed of 1 m s–1 vertically? (g = 10 m s–2)
