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प्रश्न
Fill in the blank with suitable word :
Power is the rate of doing ___________.
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उत्तर
Power is the rate of doing work.
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संबंधित प्रश्न
Define average power.
A battery lights a bulb. Describe the energy changes involved in the process.
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?
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)
Fill in the blanks with suitable words :
One watt is a rate of working of one ___________ per ___________.
An electric heater uses 600 kJ of electrical energy in 5 minutes. Calculate its power rating.
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 : work done by the car.
In loading a truck, a man lifts boxes of 100 N each through a height of 1.5 m. (g = 10 m s−2)
- How much work does he do in lifting one box?
- How much energy is transferred when one box is lifted?
- If the man lifts 4 boxes per minute, at what power is he working?
In loading a truck, a man lifts boxes of 100 N each through a height of 1.5 m.
How much energy is transferred when one box is lifted?
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)
