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.
His weight may be reduced
No frictional force may be produced between the wheels and the axle
He may increase his speed

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Physics
Isotopes of an element contain

the same number of neutrons but different number of protons
equal number of nucleons
equal number of protons and electrons
the same number of protons but different number of neutrons

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