Extracted text: A solid circular rod that is 600 mm long and 20 mm in diameter is subjected to an axial force of P = 50 kN. The elongation of the rod is 6 = 1.40 mm, and its diameter becomes d' = 19.9837 mm. Determine the modulus of elasticity and the modulus of rigidity of the material. Assume that the material does not yield. P= 50 kN 600 mm 20 mm P= 50 kN