Physics
Which alternative energy source is exhaustible?

Solar energy
Geothermal energy
Tidal energy
Wind energy

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Physics
Planets are

luminous heavenly bodies that do not twinkle
luminous heavenly bodies revolving around a star
non-luminous heavenly bodies
luminous heavenly bodies that twinkle

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

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
His weight may be reduced

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