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Mechanical Engineering QUESTION #2412
Question 1
In fluid statics, the center of pressure of a submerged plane surface is:
  • Always above the centroid of the area
  • Always at or below the centroid of the area: \(y_{cp}=y_{cg}+I_{cg}/(y_{cg}A) \geq y_{cg}\)✔️
  • At the same depth as the centroid
  • Always at the bottom edge of the surface
Correct Answer Explanation
Center of pressure: \(y_{cp}=y_{cg}+I_{cg}/(y_{cg}A)\). Since \(I_{cg}>0\), we have \(y_{cp}>y_{cg}\) — the center of pressure is always BELOW the centroid.