A crane lifts the 1.2×104 kg- steel hull of a sunken ship out of the water.aDetermine the tension in the crane's cable when the hull is fully submerged in the water.bDetermine the tension when the hull is completely out of the water.
perhaps you ought to stay with reacting a steel with an acid, on the grounds that: acid + steel - salt + hydrogen The reaction you gave is a robust one, if somewhat exothermic: Mg + 2HCl - MgCl2 + H2 perhaps swop out Magnesium for some Iron filings.
You're assuming quite a lot here! I'm not sure how part a) works without knowing things like - does the crane have to lift out water as well? If so what's the volume of the ship (actually we can do that using density but nm) For part b, assuming the rope the crane uses has negligible mass - reasonable for this example - the tension is just mass times gravityOr roughly 1.2x10^5 N
