Helium, at to = 400 K, enters a nozzle isentropically. At section 1, where A1 = 0.1 m2, a Pitot-static arrangement (see Fig. P9.25) measures stagnation pressure of 150 kPa and static pressure of 123 kPa. Estimate
(a) Ma1;
(b) Mass flow;
(c) T1; and
(d) A*.