Physics
A dynamo is a device which

Converts mechanical energy into electrical energy
Converts electrical energy into mechanical energy
Creates mechanical energy
Creates electrical energy

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Physics
The term ''equinox' means

The time when the Sun seems to be going round and round in the sky in the Arctic but does not go below the horizon
The path which the Earthtakes around the Sun
The axis of the Earth around which it rotates
When the day and night are of equal duration

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