After a shipwreck, a solid steel spoon lies at the bottom of the ocean, 5.75km below the surface. What's the water pressure at that depth? Find the fractional volume change in the spoon due to compression forces.

Answer 1

You will need the density (rho) and bulk modulus (E) of seawater.

Pressure = (rho)*g*H
where H is the depth

The density of sewater is about
1030 kg/m^3

The relative volume change is
deltaV/V = -P/E

You should be able to find E with a Google search. It may also be in your class notes or textbook.

Answer 2

The bulk modulus you want is that of steel, not seawater. (Duh)