How much water can a ship deliver to a desert island in the Caribbean?

[physicsss]

A ship, carrying freshwater to a desert island in the Caribbean, has a horizontal cross-sectional area of 3000 m^2 at the waterline. When unloaded, the ship rises 8.21 m higher in the sea. How much water was delivered?

 

[physicsss]

anyone ?

 

[arildno]

Set up balance of forces (weight of object versus buoyancy force) in both cases.
Find from this the removed weight from the ship.

 

[physicsss]

um...(M+m)g=pgAx for before
Mg=pgA(x-9) for after, where M is mass of ship and m is mass of water, p is density of seawater, A is cross sectional area? Now if that's correct, how do I compare them?

 

[physicsss]

can anyone help? I'm studying for a test on this and the test is tomorrow

 

[arildno]

Put your first equation into the right place in your second equation:
Mg=(M+m)g-pgA9
or simply:
mg=pgA9