Problem 1. The sinking of the cruise ship Lusitania by a German U-boat is often cited as a reason the United States entered WWI. Open portholes were thought to contribute to the vessel sinking in only 18 minutes with the loss of 1,198 lives. According to author Diana Preston, a prominent marine architect professor from M.I.T. "stated unequivocally that if an open porthole were submerged to a depth of three feet in the conditions of the Lusitania's sinking(See figure), it would let in 3.75 tons of water a minute." If h=z1z2=3ft and the diameter of the porthole d=16 in., estimate the flow rate and compare your answer to the above. State your assumptions