Hello Everyone, I've been trying to get the answer to this problem for ages now and I just can't match my answer with the one in the back of the textbook. I hope you can let me know what I'm doing wrong. 1. The problem statement, all variables and given/known data What is the gravitational field strength at a place 220 km above Earth's surface, the altitude of many piloted space flights. 2. Relevant equations Fg = mg Fg = Gm₁m₂/d² 3. The attempt at a solution d = 6.60 x 10³ km G = 6.67 x 10-¹¹ N.m²/kg² m₂ = 5.98 x 10²⁴ kg g = ? N/kg Fg = mg = Gm₁m₂/d² mg/m = Gm₁m₂/d²/m g = Gm₂/d² g = (6.67 x 10-¹¹ N.m²/kg²)(5.98 x 10²⁴ kg)/((6.60 x 10³ km)²) And when I do this I always get the wrong answer when I compare it with the one in the back of the textbook. The answer in the back of the textbook is 9.1 N/kg [down]. If anyone here could please help me with this, that would be great. Thanks.