A spacecraft is traveling directly toward Saturn, which exerts a gravitational force of 7.9 units on it. Saturn's moon Titan exerts a force of 10.2 units on it, at a 40 degrees to the left of the line between Saturn and the spacecraft. The moon Rhea exerts a force of 4.7 units, 80 degrees to the right of this line. (a) Find ||F STR|| , the magnitude of the sum of the forces acting on the spacecraft.
