A plane is flying with a constant speed along a straight line at an angle of 60° with the
horizontal. The weight W of the plane is 90, 000 N and its engine provides a thrust T of
120, 000 N in the direction of flight. Two additional forces are exerted on the plane: the lift
force F perpendicular to the plane’s wings, and the force R due to air resistance opposite to
the direction of motion. Draw the free-body diagram showing all forces on the plane.
Determine F and R.