Physics
The energy obtained from atoms is known as ________

Solar energy
Nuclear energy
Heat energy
Chemical energy

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

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
He may increase his speed
His weight may be reduced

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