A 259 kg satellite is in a circular orbit at an altitude of 584 km above a planet's surface. This planet is similar to our Earth. Because of air friction, the satellite eventually is brought to the Earth's surface, and it hits the Earth with a speed of 2.66 km/s.
The radius of the planet is 7 × 106 m and its mass is 4 × 1024 kg. The gravitational constant is 6.67259 × 10-11 N m2/kg2.
How much energy was absorbed by the at- mosphere through friction?
Answer in units of J.