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## Homework Statement

A rock at the surface has a density of 2600kg(m^(-3)

90000m down its density is 3100kg(m^(-3)

Change in pressure at the depth is due to hydrostatic pressure.

Whats the bulk modulus of the rock?

## Homework Equations

Δp=p + ƿgh

Δp=-B(ΔV/V)

## The Attempt at a Solution

Hydrostatic pressure:

p(90000)= 1 x 10^(5) Pa + (3100kg(m^(-3))(9.81m/s^(2))(90000m)

Δp= 2.74 x 10^(9) Pa

Δp= - B(ΔV/V)

So, (ΔV/V) => ΔV=m/ƿcompressed

And V=m/ƿintital

So the 2 m cancel and the expression for the bulk modulus is

-B=Δp(ƿcompressed/ƿinitial)

B= 3.3 x 10^(9)

I think I may have made a slight misktake please help?