A circular piece of tin 24cm in diameter has a triangular hole 9cm by 12cm by 15cm. The vertex of the triangle at the intersection of the 9cm and 12cm sides are at the center of the circle. How far is the centroid of the area to the center of the circle

Bar ABC has an outer diameter of 10 mm and is made of red brass for which E = 100 GPa. Section AB is hollow with a wall thickness of 2 mm and section BC is solid. Knowing that P is 24 kN, applied to both sides of the bar at B and Q is 8 kN, applied to the bar at C as shown. What is the total %3D change in length of bar ABC? Express your answer in mm, to the nearest 0.01 mm, taking elongation as positive and contraction as negative. 4 13 'A В C P 400 mm -600 mm-