Physics
The characteristic invalid for heat radiation is that it travels :

Heating the medium through which it passes
With the speed of light
In a straight line
In all directions

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Physics
Railway tracks are banked on curves so that

The train may not fall down inwards
Necessary centripetal force may be obtained from the horizontal component of the weight of the train
Necessary centrifugal force may be obtained from the horizontal component of the weight of the train
No frictional force may be produced between the tracks and the wheels of the train

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Physics
Of the four locations mentioned below the highest inside temperature will be attained in the pressure cooker operated with the pressure valve open

in an aeroplane flying at a height of 10,000 m with inside pressure maintained at the sea level
at sea level
at the top of Mt. Everest
at a place in a valley below sea level

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