The International Space Station (ISS) orbits the Earth at an altitude (distance above the surface of the Earth) of 408 km, conducting various experiments in a "weightless" environment. Consider the force(s) acting on the ISS and write a simplified equation relating its force(s) to speed. Air resistance is negligible. (HINT: The centripetal force is equal to the net inward force on an object. You are being asked to write an equation to find speed.)