1. The problem statement, all variables and given/known data The center of a 1.40 km diameter spherical pocket of oil is 1.40 km beneath the Earth's surface. Estimate by what percentage g directly above the pocket of oil would differ from the expected value of g for a uniform Earth? Assume the density of oil is 8.0×102kg/m3. 2. Relevant equations F=(m1m2G)/r^2 3. The attempt at a solution I got the mass for the pocket of oil, then subtracted the distance its beneath the earth from the earths radius for the length, I ended up getting F=1.1x10^13N, and from here on I'm lost. I divided that number by the oils mass (1.12x10^12kg) and got a number close to g, then got a percentage for the difference, but it's still incorrect. Someone please tell me what I'm doing wrong. Thank you.