1. The problem statement, all variables and given/known data A 500-kg satellite is in a circular orbit at an altitude of 500 km above the Earth’s surface. Because of air friction, the satellite eventually falls to the Earth’s surface, where it hits the ground with a speed of 2.00 km/s. How much energy was transformed into internal energy by means of air friction? 2. Relevant equations 3. The attempt at a solution Total Energy of satellite = PE = KE = G(mass of satellite)(mass of Earth)/ - 2 (Earth's radius + orbit's height) = -1.45 x 10^10 J KE before crash = 0.5 (500)(2000)^2 = 1 x 10^9 J Energy loss due to friction - 1.45 x 10^10 - 1 x 10^9 = 1.55 x 10^9 J But the answer is 1.58 x 10^9 J, what is missing? Thanks in advance!