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11. Work and Energy
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Q6 of 49 Page 11

Define 1 watt of power.

When the work of 1 joule is done in a time of 1 s, the power is said to be one watt.

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4

How fast should a man of 50 kg run so that his kinetic energy will be 625 J?

5

What is power? Write its SI unit.

7

A lamp consumes 1000 J of electrical energy in 10 s. What is its power?

8

A force of 7 N acts on an object. The displacement is, say 8 m, in the direction of the force (see Figure below). Let us take it that the force acts on the object through the displacement. What is the work done is this case?

Questions · 49
11. Work and Energy
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