Physics
A dynamo is used to convert

Electrical energy into mechanical energy
Magnetic energy into mechanical energy
Mechanical energy into electrical energy
Electrical energy into magnetic energy

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Physics
We always see the same face of the moon, because

It rotates at the same speed as the earth around the sun
It revolves on its axis in adirection opposite to that ofthe earth
It is smaller than the earth
It takes equal time for revolution around the earth and rotation on its own axis

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