1. The problem statement, all variables and given/known data You are explaining to friends why astronauts feel weightless orbiting in the space shuttle, and they respond that they thought gravity was just a lot weaker up there. Convince them and yourself that it isn't so by calculating how much weaker gravity is 250 km above the Earth's surface. 2. Relevant equations GM/R^2 = g 3. The attempt at a solution I know the value of G is 6.67*10^-4 Nm^2/kg and the mass of the earth is 5.9*10^24kg. But whenever I plug in the radius values for R, I get a number like: 9.667*10^7m/s^2. which can't be correct. I can't figure out what I'm doing wrong with my calculations. Any help would be appreciated!