Physics
A dynamo is used to convert

Mechanical energy into electrical energy
Magnetic energy into mechanical energy
Electrical energy into mechanical energy
Electrical energy into magnetic energy

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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
He may increase his speed
No frictional force may be produced between the wheels and the axle

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