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प्रश्न
Name the physical quantity whose unit is watt.
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उत्तर
Power is the physical quantity whose SI unit is watt. Power is defined as 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.
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)
What is the power of a body which is doing work at the rate of one joule per second?
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.
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 an experiment to measure his power, a student records the time taken by him in running up a flight of steps on a staircase. Use the following data to calculate the power of the student :
Number of steps = 28
Height of each step = 20 cm
Time taken = 5.4 s
Mass of student = 55 kg
Acceleration = 9.8 m s−2
due to gravity
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?
