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How much work is done by a weight lifter...

How much work is done by a weight lifter when he holds a weight of 80 kg on his shoulders for two minutes?

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MODERN PUBLICATION-WORK AND ENERGY-EXERCISE
  1. Identify energy possessed by rolling stone

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  2. Identify energy possessed by running athelete.

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  3. How much work is done by a weight lifter when he holds a weight of 80 ...

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  4. A force of 10 N moves a body with a constatn speed of 2ms^-1. Calculat...

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  5. A car and a truck are moving with the same velocity of 60 kmh^-1. Whic...

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  6. What will be the kinetic energy of a body when its mass is made four t...

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  7. A body is thrown vertically upwards. Its velocity goes on decreasing. ...

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  8. State the energy conversion in a dry cell.

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  9. A coolie is walking on a railway platform with a load of 30 kg on his ...

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  10. What is the work done by earth in moving around the sun?

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  11. When displacement is in a direction opposite to the direction of force...

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  12. Define 1kWh.

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  13. In an oscillating pendulum, at what positions are the potential and ki...

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  14. How many joules are present in 1 kilowatt hour?

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  15. Name the term used for the sum of kinetic and potential energy of a bo...

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  16. What type of energy conversion takes place in a thermal power plant?

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  17. If the heart works 60 joules in one minute. What is its power?

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  18. State the value of commercial unit of electrical energy in joule.

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  19. At what rate is electrical energy consumed in a 60 W bulb?

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  20. Give an example of a body having potential energy due to change in sha...

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