Solve the Problem $60 \mathrm { lb } / \mathrm { ft } ^ { 3 }$

Multiple Choice

Solve the problem.
-A tank truck hauls oil in a 4-ft-diameter horizontal right circular cylindrical tank. If the density of the oil is $60 \mathrm { lb } / \mathrm { ft } ^ { 3 }$ , how much force does the oil exert on each end of the tank when the tank is half full?

A) 720 lb
B) 320 lb
C) 480 lb
D) 160 lb