Problem
Two moons orbit the same planet. The inner moon at an average distance of 1.91 x 10^8m and has an orbital period of 2.16 x 10^5s. Calculate Kepler's constant for this planet and use it with the outer moon's orbital radius of 4.36 × 10^8 m to make an estimate of the orbital acceleration of the outer moon in meters per second per second to two significant figures.