The mass flow of air through a turbojet engine in flight is 0.5 slug/sec, and the jet exhaust velocity is 1,000 fUsec. The flight velocity is 180 knots, and neglecting the mass of the fuel burned, find (a) (6pts) the magnitude of the gross thrust in lb (b) (6pts) the magnitude of the ram drag in lbr (c) (6pts) the propulsive efficiency (d) (6pts) thrust if the fuel flow rate of 0.10 slugs/sec is added to the airflow through the engine (Note that Pest=0.00238 slug/ft and 1 knot = 1.687 ft/s)