A stress-strain graph for a glass rod, plotted up to the point where it fractures, is displayed below. Which statement about the glass rod is correct?
- AHooke’s law is obeyed for all values of stress up to the breaking point.
- BThe glass is ductile.
- CThe glass shows plastic deformation.
- DWhen the cross-sectional area of the rod is doubled, the ultimate tensile stress of the rod is halved.