Advertisements
Advertisements
प्रश्न
Fill in the blank with suitable word :
Power is the rate of doing ___________.
Advertisements
उत्तर
Power is the rate of doing work.
APPEARS IN
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.
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?
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. (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?
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 :
