A Cylinder, Semicircular in Cross-Section, Is 10 M Long $2.0 \times 10 ^ { 6 } \mathrm {~N}$

Multiple Choice

A cylinder, semicircular in cross-section, is 10 m long and 5.0 m in radius. It is completely submerged, with its flat bottom side horizontal and 8.0 m below the water surface, as shown in the figure. What is the magnitude of the net force on the curved upper surface of the half-cylinder? Neglect atmospheric pressure.

A) $2.0 \times 10 ^ { 6 } \mathrm {~N}$
B) $3.0 \times 10 ^ { 6 } \mathrm {~N}$
C) $4.0 \times 10 ^ { 6 } \mathrm {~N}$
D) $3.5 \times 10 ^ { 6 } \mathrm {~N}$
E) $2.5 \times 10 ^ { 6 } \mathrm {~N}$