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प्रश्न
Name five appliances or machines which use an electric motor.
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उत्तर
Five appliances that use electric motor are:
(i) Electric fans
(ii) Washing machines
(iii) Refrigerators
(iv) Mixer and grinder
(v) Hair dryer
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संबंधित प्रश्न
What are the two kinds of mechanical energy?
A boy of mass 40 kg climbs up the stairs and reaches the roof at a height 8 m in 5 s. Calculate:
- the force of gravity acting on the boy,
- the work done by him against the force of gravity,
- the power spent by boy. (Take g = 10 m s-2)
State the SI unit of work.
Determine the amount of work done when an object is displaced at an angle of 30° with respect to the direction of the applied force.
On what factors does the work done by a force depend?
Fill in the boxe to show the corresponding energy transformation.

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One labourer carried four pans of road metal through a distance of 100 metres. If he carries two pans of road metal through a 200 metre distance ______ work will be done.
Mention whether work is done or not in the following activity.
| S. No | Activity | Work done or not done |
| 1. | Pushing the door | |
| 2. | Holding a doll | |
| 3. | Sitting in a bus | |
| 4. | Pushing a wall | |
| 5. | Digging soil |
