Which of the following is an example of mode of transport making use of air pressure ?
A
Sailing boat in an ocean
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B
Rowing boat on a windy day
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C
Aeroplane in a sky
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D
All the above
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Solution
The correct option is D All the above
A moving boat's sail is shaped as an airfoil like the wing of a plane. When air moves over a plane's wing, from front to back, wind flowing over the top of the wing has to travel farther than wind flowing under the wing's bottom surface. This creates a pressure difference that lifts the plane.