Physics
On a stationary sail boat, air is blown from a fan attached to the boat. The boat

spins around
moves in opposite direction in which the air is blown
moves in the same direction in which air blows
does not move

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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

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

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Physics
Railway tracks are banked on curves so that

Necessary centripetal 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
The train may not fall down inwards
Necessary centrifugal force may be obtained from the horizontal component of the weight of the train

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