4-143. If F₁ = 7 kN and FB = 5 kN, represent the force system by a resultant force, and specify its location on the x-y plane. Problems 4-143/144 150 mm. 100 mm 6 kN 650 mm- FB 750 mm 600 mm IFA 8 kN] 700 mm 150 mm 100 mm

Determine the resultant and angle of concurrent forces system using algebraic method. F1=P F2=2P F3=P F4=3P F5=1P F6=2P F7=P F8=7P F9=7P 0₁-45 0₂-45 03-70 04=20 05=45 06-45 07-30 08-40 09-20 FA F5 F6 04 05 0₂ 06 F3 0₂ 0, 08 09 F₂ Fg 8 F₂ Fg F₁

The forces acting on the arm of an athlete doing shoulder exercises are shown in the figure. The athlete holds his arm at an angle of β = 30° with the horizontal axis . Point O represents the axis of rotation in the shoulder joint, point A represents the connection point of the deltoid muscle to the humerus, point B represents the center of gravity of the arm, and point C represents the application point of the force acting on the hand. The distances between the rotation axis (O point) of the shoulder joint and the points A, B and C are a=22 cm , b =33 cm and c= 60 cm , respectively .  A force of F= 120 N,  which makes an angle of γ=30° with the vertical from the point C, acts on the athlete's hand  .   Weight of the athlete's armW= 80 N. The direction of application of the Fm muscle force makes an angle of α=20° with the longitudinal axis of the arm. According to this; a) Calculate the muscle strength  F M b) Calculate  the angle θ of the joint reaction force F J with the horizontal.…

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