Aperfect gas is expanded from 1cubic metre to 2 cubic metre. which process will have the highest work done? select one: a. constant pressure processb. constant temperature processc. adiabatic processd. polytropic process with n = 1.5

Asolid steel sphere (k=63.9 w m-1 k-1 , ? =7832 kg m-3 , c=0.523 kj kg-1 k-1 ), 100 mm in diameter is initially at a uniform temperature of 500o c and is suddenly quenched in a large oil bath for which t? = 100o c and h = 3200 w m-2 k-1. estimate the time required for the sphere to cool to 200o c and to 110o c