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Is energy a scalar or a vector quantity?...

Is energy a scalar or a vector quantity? Why?

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MODERN PUBLICATION-WORK AND ENERGY-EXERCISE
  1. Which physical quantity has a unit electron volt (eV)?

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  2. Which physical quantity has its unit kWh?

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  3. Is energy a scalar or a vector quantity? Why?

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  4. Define kinetic energy?

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  5. What is mechanical energy?

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  6. Name the kind of energy stored in a stretched bow.

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  7. When the height of an object is increased, what happens to its potenti...

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

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  9. State the law of conservation of energy.

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  10. What is the relationship between power force and velocity?

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  11. Seema tried to push a heavy rock of 100 kg for 200s but could not move...

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  12. At what speed of a body of mass 1 kg will have a kinetic energy of 1J?

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  13. Identify energy possessed by rolling stone

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  14. Identify energy possessed by running athelete.

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

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

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

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

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

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  20. State the energy conversion in a dry cell.

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