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The power output of an engine is 3 kW. H...

The power output of an engine is 3 kW. How much work does the engine do in 20 s ?

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The correct Answer is:
60 kJ
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LAKHMIR SINGH & MANJIT KAUR-WORK AND ENERGY-Exercise
  1. What kind of energy transformations take place at a coal-based thermal...

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  2. A man weighing 500 N carried a load of 100 N up a flight of stairs 4 m...

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  3. The power output of an engine is 3 kW. How much work does the engine d...

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  4. An electric heater uses 600 kJ of electrical energy in 5 minutes. Calc...

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  5. How much electrical energy in joules does a 100 watt lamp consume : ...

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  6. Five electric fans of 120 watts each are used for 4 hours. Calculate t...

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  7. Describe the energy changes which take place in an radio.

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  8. Write the energy transformations which take place in an electric bulb ...

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  9. Name five appliances or machines which use an electric motor.

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  10. A bulb lights up when connected to a battery. State the energy change ...

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  11. The hanging bob of a simple pendulum is displaced to one extreme posit...

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  12. A car of weight 20000 N climbs up a hill at a steady speed of 8 m/s, g...

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  13. (a) What is the meaning of the symbol kWh ? What quantity does it repr...

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  14. (a) Derive the relation between commercial unit of energy (kWh) and SI...

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  15. (a) Define power. Give the SI unit of power. A boy weighing 40 kg ca...

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  16. When a body falls freely towards the earth, then its total energy

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  17. Which one of the following is not the unit of energy?

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  18. Which of the following energy change involves frictional force?

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  19. An electric motor raises a load of 0.2 kg, at a constant speed, throug...

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  20. An object is falling freely from a height x. After it has fallen a hei...

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