Rhea, one of Saturn’s m ns, has a radius of 765 km and an acceleration due to gravity of 0.278 m/s2 at its surface. Calculate its mass and average density.

Solution 14E Mass and average density of the Saturn’s moon Rhea whose radius is 765 km (765000 m) and acceleration due to gravity is 0.278 m/s can be calculated using the relations as follows. Step 1 of 2 Mass is related to radius(R) ,acceleration due to gravity(g) and Gravitational constant(G) by 2 gR M = G 0.278×(765000) 2 = 11 6.67×10 = 2.44 × 101 kg