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प्रश्न
Fill in the blank with suitable word :
Power is the rate of doing ___________.
उत्तर
Power is the rate of doing work.
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संबंधित प्रश्न
What is power?
A battery lights a bulb. Describe the energy changes involved in the process.
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.
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 body does 1200 joules of work in 2 minutes. Calculate its power.
An electric heater uses 600 kJ of electrical energy in 5 minutes. Calculate its power rating.
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)
