Physics
The term ''equinox' means

When the day and night are of equal duration
The path which the Earthtakes around the Sun
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 axis of the Earth around which it rotates

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Physics
A cyclist leans inwards when he is negotiating a curve so that

His weight may be reduced
He may increase his speed
Necessary centripetal force may be available from the horizontal component of the normal reaction due to the track to maintain the curved motion.
No frictional force may be produced between the wheels and the axle

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