Awoman is holding a 3.9-kg sphere in her hand with the entire arm held horizontally as shown in the gure. A tensile force in the deltoid muscle prevents the arm from rotating about the shoulder joint 0; this force acts at the 20 angle shown. Determine the force FD exerted by the deltoid muscle on the upper arm atA and the x- and y- components of the force reaction at the shoulderjoint 0 (positive to the right and up). The mass of the upper arm is mU= 1.6 kg, the mass of the lower arm is mL= 1.2 kg, and the mass of the hand is mH= 0.3 kg; all the corresponding weights act at the locations shown in the gure. 3.9(9.81) N