Physics
Which of the following is a device designed to protect electrical devices from voltage spikes?

Surge protector
Voltage unloader
Current unloader
Heat protector

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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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