A crane lifts the 18,000-kg steel hull of a ship out of the water at constant velocity.(A) Determine the tension in the crane’s cable when the hull is submerged in the waterInclude a free body diagram of the hull in your work.(B) Find the tension when the hull is completely out of the water.Thanks so much in advance for any help!!
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I think that at constant velocity the tension would be the weight of the ship, as the only acceleration force would be gravity And the weight of the ship submerged, for sake of a problem like this, is probably assuming no air pockets, so you'd want to subtract the weight of the volume of water that the ship displaces; perhaps you can get at that, by comparing the denisty of water to the density of steel And the weight of the ship completely out of water, would in a problem like this assume that there are no pockets of water remaining in the ship But there's one snag: ships are most often described by their displacement, in tonsSo I, for one, am not at all sure if the 18,000 kg means the weight of the steel, out of water; or the weight of water displaced, when the ship is afloat in a normal way; or whatAnd that's where I'd get stuckSince it's most likely a school problem, I'd go ahead anyway, just to show that they're succeeding in teaching me at least a little something, and make assumptions needed for the problem to be workableIn this case, I'd take the 18,000 kg as the weight of the metal, out of water, which would answer (B), and work on (A) from that, using density of steel and density of water I hope that's enough help, as I need to go do chores nowand thank you, it's an unusual question!
