MCAT Physics Question 57: Answer and Explanation

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Question: 57

12. Bernoulli's equation is the reason for the upward force that permits airplane flight. Which statement best summarizes the equation's relationship to flight?

  • A. The speed of airflow is equal on the top and bottom of a wing, resulting in nonturbulent flight.
  • B. The speed of airflow is greater over the curved top of the wing, resulting in less pressure on the top of the wing and the production of a net upward force on the wing, in turn resulting in flight.
  • C. The speed of airflow on the flat bottom of the wing is greater than over the curved top of the wing, resulting in more pressure below the wing and the production of a net upward force on the wing, in turn resulting in flight.
  • D. The weight of the wing is directly proportional to the weight of the air it displaces.

Correct Answer: B

Explanation:

Airplane wings have curved upper surfaces and flat lower surfaces, which causes the air to flow faster over the top of the wing because it has further to travel to the edge of the wing than the air over the flat bottom surface. Increased air speed will mean lower pressure within the fluid. This will result in higher pressure below the wing and an upward force.

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