A cylindrical specimen of a cold-worked brass has a ductility (%EL) of 40%. If its cold-worked radius is 13 mm, what was its radius before deformation

For a process taking place in a closed system containing gas, the volume and pressure relationship is pvi-constant. -1.5 bar, the process starts with initial conditions, pi = =0.03 m3 and ends with final volume, v2-0.05 m3 determine the work done by the gas.