1. The problem statement, all variables and given/known data 2. The space shuttle is orbiting the Earth at a distance of about 200 km from its surface. At that distance, the gravitational acceleration is almost the same as that on the surface. (a) How long does it take for the shuttle to complete one orbit around the Earth? Assume that the orbit is circular. (b) The density of air at 200 km is about 5 × 10−10kgr m−3. How many orbits will it take for aerodynamic drag to reduce the velocity of the shuttle by 10%? The coefficient of aerodynamic drag for the shuttle is ' 0.5, the surface area projected along the direction of motion is ' 400 m2, and the weight of the shuttle midway through a mission is about one million tons. 2. Relevant equations R=.5DpAv^2 3. The attempt at a solution Ok i got the portion of (a). i got an answer of 88.4413minutes. thats also with a velocity of 7.7887km/s. I just cant get b. thanks for any help.