Calculating Ship Mass from Water Density Change

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To calculate the mass of the ship before unloading, the relationship between the ship's weight and the density of water is crucial. When the ship transitions from seawater to freshwater, it sinks slightly due to the change in buoyancy. The equation (W + 600,000) / W = R, where R is the ratio of seawater density to freshwater density, can be used to find the ship's weight. By determining R and solving for W, the original mass of the ship can be established. Understanding this relationship is key to solving the problem effectively.
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Can anybody help me on this one

A ship sails from sea water into fresh water and therefore sinks slightly.When its load of 600000kg is removed,its returns to its original level.Assuming the sides of the ship are vertical at the water line,find the mass of ship before it was unloaded.

I fail to understand because we don't have the weight of the ship.
 
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You need the ratio R of the densitiy of ocean water to fresh water.

(W+600000)/W=R
 
Thanx very much mathman
 
Of course, if you look up R and then solve for W, it will be the answer to your question! Do you see why?
 

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