(a) Young's modulus = Gradient of graph
Gradient of graph = [Δy / Δx]
Gradient of graph = [(300 - 0) X 10^{6}/ (0.005 - 0)]
Young's modulus = 6 X 10^{6} Nm^{-2}.
(b) The yield point is the point at which extension is no longer proportional to the applied stress. 3 X 10^{8} Nm^{-2}. |