Physics
A balloon filled with hydrogen will

Continue going upwards uninterrupted
Reach a particular height and start coming down
Reach a particular height and remain floating
Burst after reaching some height

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

His weight may be reduced
He may increase his speed
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

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