Physics
Light from the star, Alpha Centauri, which is nearest to the earth after the sun, reaches the earth in

42 seconds
4.2 seconds
42 years
4.2 years

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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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