By navigating to the site http://spaceflight.nasa.gov/realdata/tracking/ you can obtain tracking information giving the altitude and speed of the international space station. Suppose that the information displayed on the site was as shown in the screen capture above. By making the assumption that the space station's orbit is a circle with its center at the center of the earth, find the approximate acceleration experienced by the space station as a result of the gravitational pull of the earth.