2. An underground fresh water reservoir with a semi-cylindricalcave is attached

2. An underground fresh water reservoir with a semi-cylindricalcave is attached to a U-tube manometer with a SG2=5.2 liquid. a)Hand-draw the hydrostatic pressure variation along the line a-b. b)Calculate the vertical force on the cave for R=10 ft h1=120 fth2=16 ft a depth (normal to the paper) of 100 ft and PA=21.9psia.