Find the angle between the forces given the magnitude of their resultant. (Hint: Write force 1 as a vector in the direction of the positive x-axis and force 2 as a vector at an angle with the positive x-axis.)
Force 1 ........................ Force 2 ........................ Resultant Force
1. 45 pounds .................. 60 pounds ........................ 90 pounds
2. 3000 pounds ...............1000 pounds ........................ 3750 pounds