How fast would the international space station (iss) have to travel to maintain a circular orbit a distance of 1400 km above the earth?

The International Space Station move at 7.22 km/s.

Explanation:

Orbital speed of satellite is given by  , where G is gravitational constant, M is mass of Earth and r is the distance to satellite from centre of Earth.

r = R + h = 6350 + 1400 = 7750 km = 7.75 x 10⁶ m

G = 6.673 x 10⁻¹¹ Nm²/kg²

M = 5.98 x 10²⁴ kg

Substituting

  The International Space Station move at 7.22 km/s.      

that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

hope this ! : )

dang that balls went far