3. A 78kg man is carrying two bags (W.) each weighing 30kg while ascending a staircase as shown in the figure below. Ass

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3 A 78kg Man Is Carrying Two Bags W Each Weighing 30kg While Ascending A Staircase As Shown In The Figure Below Ass 1 (239.37 KiB) Viewed 37 times

3. A 78kg man is carrying two bags (W.) each weighing 30kg while ascending a staircase as shown in the figure below. Assume that the geometric parameters and the weight of the leg are measured in terms of the person's height h and total weight W as follows: a=0.05h = |OA|; b = 0.20h = |AB|; c = = 0.52h = |AC|; a = 45° (angle |OA| makes with the horizontal); ß = 80° (angle |AB| makes with the horizontal); = 70°, W₁ = 0.17W. Calculate the magnitude and sense of the muscle force and joint reaction force. Some useful equations: FMy FM cose and FMX = FM sine (20 MARKS) FJy FMY Wo Wo Figure 2: A man carrying loads. A 10 + FJz FM= B W₁ W Figure 3: Forces acting on the lower leg in a one leg stance.