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Archimedes' Principle relates the weight of a fluid displaced to the object placed in the fluid. If the weight of the fluid displaced is less than the object's weight ,then the object sinks. When the weights of the object and displaced water are equal, the object will float.
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Sometimes an inpaled object is best left in place rather than removing it at the scene of the accident . Removing the object could cause sudden blood loss. Pack round the the object to stemPeripheral blood flow, and prevent further pain and trauma.
The British helmet used by soldiers during the First World War, also referred to as World War I or The Great War, was a steel helmet which was called the Brodie Helmet. Soldiers wore these to protect their heads as contact between their heads and another object like bullets or melee weapons could prove to be dangerous and life-threatening.
The Union Merchant Marine decline during the Civil War because its ships were object of a relentless and successful hunting by the cruiser of Confederate Navy or by the privateers. It became so weakened that it was replaced in its routes by other merchant marines, mainly that of Great Britain and after the war it was no more able to restore its former importance on the top of the maritime trading he had had before the war.