On a day with atmospheric pressure equal to 987 kPa, a manometer
(u-tube) open on both ends is filled with water (Density= 1000
kg/m3) on one side and with oil (Density = 870 kg/m3) on the other
side. When the fluid levels come to equilibrium, the oil water
interface is at the exact lowest part of the curved tube, and the
column of oil is 5.7 cm higher than the water. What is the height
of the water column if the diameter of the manometer tube is 2.5
mm?