Physics
For which one of the following does the centre of mass lie outside the body?

A ring
A fountain pen
A cricket ball
A book

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

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

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