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PHYSICS! I dont get it?

A crane lifts the 16500 kg steel hull of a ship out of the waterDetermine the following(a) the tension in the crane's cable when the hull is submerged in the water(b) the tension when the hull is completely out of the water.

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weight of hull Wmg 165009.8 161700 N; a) Archimedes law: weight of hull in water F W-w, where wpvg is weight of water, vm/q is volume of hull, p1000 kg/m^3 is water density, q7800 kg/m^3 is steel density; thus Fmg - pvg mg – p(m/q)g mg(1-p/q) 161700(1-1/7.8) 140969.2 N;

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