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
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A.
76cm of Hg
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B.
75cm of Hg
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C.
74cm of Hg
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D.
60cm of Hg
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E.
45cm of Hg
Correct Answer: Option B
Explanation
P1 = p + 15, p2 = p - 15
v1 = 30cm, v2 = 45cm
P1v1 = p2v2
p = 75cm of Hg
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