Physics
Which phase change is an example of an exothermic process?

Liquid to Solid
Gas to Solid
Gas to Liquid
All listed here

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Physics
Ice is packed in saw dust because

Saw dust is poor conductor of heat.
Saw dust does not stick to the ice.
Saw dust will not get melted easily.
Saw dust is a good conductor of heat.

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

He may increase his speed
No frictional force may be produced between the wheels and the axle
His weight may be reduced
Necessary centripetal force may be available from the horizontal component of the normal reaction due to the track to maintain the curved motion.

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