Problem n1. 20mm 90mm 80mm steel copper Problem n2. Semicircle steel 40mm у 20mm 20mm X 40mm X 1. Locate the center of m

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Problem n1. 20mm 90mm 80mm steel copper Problem n2. Semicircle steel 40mm у 20mm 20mm X 40mm X 1. Locate the center of mass G of this uniform thickness plate shown? • The density of steel ps = 7800 kg/m³ • The density of copper pc = 8960 kg/m³ 2. If this same plate is all in steel, determine its centroid? Determine the polar moment of inertia of the bleu area shown with respect to 0 (z- axis).