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