The set-up illustrated above shows a capillary tube of uniform cross-sectional area in two different…

Physics WAEC 1991

The set-up illustrated above shows a capillary tube of uniform cross-sectional area in two different arrangements. Using the data in the diagrams. Calculate the pressure of the atmosphere

  • 76cm of Hg
  • 75cm of Hg checkmark
  • 74cm of Hg
  • 60cm of Hg
  • 45cm of Hg

The correct answer is: B

Explanation

P1 = p + 15, p2 = p - 15

v1 = 30cm, v2 = 45cm

P1v1 = p2v2

p = 75cm of Hg
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