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Answer :

We know that, \( Power \ = \ \frac{Work}{Time} \)

Time = 10 s

Work done = Energy consumed by the lamp = 1000 J

\(\therefore Power \ = \ \frac{1000}{10} \ = \ 100 \ J/s \ = \ 100 \ W \)

- A force of 7 N acts on an object. The displacement is, say 8 m, in the direction of the force (Fig. 11.3). Let us take it that the force acts on the object through the displacement. What is the work done in this case?
- When do we say that work is done?
- Write an expression for the work done when a force is acting on an object in the direction of its displacement.
- Define 1 J of work.
- A pair of bullocks exerts a force of 140 N on a plough. The field being ploughed is 15 m long. How much work is done in ploughing the length of the field?
- What is the kinetic energy of an object?
- Write an expression for the kinetic energy of an object.
- The kinetic energy of an object of mass m, moving with a velocity of 5 m/s is 25 J. What will be its kinetic energy when its velocity is doubled? What will be its kinetic energy when its velocity is increased three times?
- What is power?
- Define 1 watt of power.
- Define average power

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