Please select a subject first
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Name the physical quantity whose unit is watt.
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What is the power of a body which is doing work at the rate of one joule per second?
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A body does 1200 joules of work in 2 minutes. Calculate its power.
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Fill in the blank with suitable word :
Power is the rate of doing ___________.
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Fill in the blanks with suitable words :
One watt is a rate of working of one ___________ per ___________.
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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.
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A man weighing 500 N carried a load of 100 N up a flight of stairs 4 m high in 5 seconds. What is the power?
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The power output of an engine is 3kW. How much work does the engine do in 20 s?
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An electric heater uses 600 kJ of electrical energy in 5 minutes. Calculate its power rating.
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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.
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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.
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Define power. Give the SI unit of power.
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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)
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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
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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?
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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?
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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)
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Which one of the following statements about power stations is not true?
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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 :
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