MCAT Physics Question 55: Answer and Explanation

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Question: 55

10. An hydraulic system is designed to allow water levels to change depending on a force applied at the top of the tank as shown. If a force, F1, of 4 N is applied to a square, flexible cover where A1 = 16, and the area A2 = 64, what force must be applied to A2 to keep the water levels from changing?

  • A. 4 N
  • B. 16 N
  • C. 32 N
  • D. No force needs to be applied.

Correct Answer: B

Explanation:

This is a basic restatement of Pascal's principle that a force applied to an area will be transmitted through a fluid. This will result in changing fluid levels through the system. The relationship is stated as

Plugging in the numbers gives an answer of 16 N.

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