Fat+Man

=Fat Man=

Physics package



==A "Fat Man" bomb was dropped over Nagasaki, Japan, on Aug. 9, 1945, near the end of World War II. Released by the B-29 boomer, the 10,000-pound weapon was detonated at an altitude of approximately 1,800 feet over the city. The bomb had an explosive force (yield) of about 20,000 tons of TNT, about the same as the bomb dropped on Hiroshima. Because of Nagasaki's hilly terrain, however, the damage was somewhat less extensive than of the relatively flat Hiroshima.== =="Fat Man" was an implosion-type weapon using plutonium. A subcritical sphere of plutonium was placed in the center of a hollow sphere of high explosive (HE). Numerous detonators located on the surface of the HE were fired simultaneously to produce a powerful inward pressure on the capsule, squeezing it and increasing its density. This resulted in a supercritical condition and a nuclear explosion.==

==Nagasaki was not America's primary target. This was Kokura. The three potential targets for a second bomb were Kokura, Kyoto and Niigata. Nagasaki was only added to a list of potential targets when Kyoto was withdrawn (it had been the secondary target for a second bomb) because of its religious associations. The third potential target was Niigata - but this was withdrawn from the list as the distance to it was considered to be too great. Therefore, the Americans were left with just two targets - Kokura and Nagasaki.==