Physics
A cup of hot coffee is placed on a metal table in a room. By which of the following methods does it lose heat?

Conduction and convection only
Conduction and radiation only
Conduction, convection and radiation
Convection and radiation only

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Physics
Which one of the following statements with regard to Jet stream, an upper level tropospheric wave, is not correct?

Jet streams are typically continuous over long distances.
It is narrow band of high-velocity wind.
In summer, the polar front jet achieves its maximum force.
It follows the wave path near the tropopause at elevations of 8 km to 15 km.

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