Please answer in 4 decimal places with GIVEN, REQUIRED AND SOLUTION

7. From the figure below, both the tank and the slanted tube are open to the atmosphere. If L=3.12 m, what is the angle of tilt of the tube. 50 an Oil, SG-0.8 --- 50 an Water, SG - 1.0 6. An oil well is 17,500 ft deep. The pressure of the oil at the bottom is equal to the pressure of a column of seawater 15,500 ft deep. The density of the oil is 55 lb/ft'. What is the exerted pressure at the surface of the oil in the well? (Density of sea water = 63.9 lb/ft ha