PROBLEM: The speed of earthquake P-waves, Vp , can be calculated using the equation below. The quantities p, x and y relate to the physical properties of the rock (and their values are in SI units): p is the density, x describes ease of compression and y describes the rigidity of the rock.
Vp = √ x + 4/3 y (divided by p)
calculate the value of Vp if x = 1.6 x 1011 N m-2
y = 6.4 x 1010 N m-2
p = 3.4 x 103 kg m-1
answer in km s-1
then rearrange the equation to make p the subject
This is a numerical problem related to calculating earthquake p-wave speeds.