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PRACTICE / Pressure

A hatch responds to pressure difference

A flat hatch of area 20 cm² has uniform absolute pressures 180 kPa and 100 kPa on its opposite faces.

What is the magnitude of the resultant pressure force?

Organize the givens & assumptions
  • Area = 20 cm²
  • Pressures = 180 kPa and 100 kPa

Pressures act normally on parallel opposite faces; ignore edge forces, weight and any pressure variation over each face.

  1. A560 N560\ \mathrm N
  2. B16 N16\ \mathrm N
  3. C160 N160\ \mathrm N
  4. D360 N360\ \mathrm N

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