Assume that the interior of the earth can be treated as an incompressible fluid in equilibrium. {HINT: Let ? denote the density; take ? to be a constant; ? = M/V.}
(A) Calculate the pressure within the earth p(r) as a function of distance from the center r.
(B) Using appropriate values for earth's mass and radius, calculate the pressure at the center. Express the answer in tons per square inch.