For Question 1, I am using the equation g = GM/r^2 , where G is 6.67 *10^-11, M is 1.9 *10^27 kg, and r is 7.1 *10^4 km, and I get 2.514 * 10^7. But then the question asks what is the number of g's in Earth. I don't understand what that last part means.
For Question 2, I thought about...