Physics
Which process allows water to enter the atmosphere?

Condensation
Transpiration
Evaporation
Respiration

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Physics
On a cold day when a room temperature is 15oC, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15oC, because

plastics have a higher thermal conductivity than metals
metals are good conductor of heat
plastics have a lower density than metals
metals have higher thermal capacity than plastics

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Physics
Railway tracks are banked on curves

necessary centripetal force may be obtained from the horizontal component of the weight of the train
to avoid frictional force between the tracks and wheels
the train may not fly off in the opposite direction
necessary centrifugal force may be obtained from the horizontal component weight of the train

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