Problem 4: A rocket's exhaust has a solid mass fraction X = 0.12, Cs = Cp = 250 To2 = kg. K 3000K, Poz = 2MPa, pe = 60kPa and the gases have specific heat ratio y=1.2. Find a) the exhaust velocity, if the particles are small, Ts = Ty, Us = ug b) the exhaust velocity, if the particles are large, Ts = 2900K = const., us = 150 - = const. S c) the exhaust velocity if there were no particles in the exhaust (X = 0)