Extracted text: Q:9/ A steel bar (50mm) in diameter and (2m) long is surrounded by a shell of cast iron (5mm) thick. Compute the load that will compress the combined bar a total of (1mm) in the length of (2m). For steel, (E=200*10° N/m), and for cast iron, (E=100*10° N/m²). Ans.(p=240KN)