Final answer:
Conditions permit the possibility of a normal shock entering the nozzle based on compressible flow principles. statement is True
Step-by-step explanation:
Based on compressible flow principles, the conditions permit the possibility of a normal shock entering the nozzle. A normal shock occurs when the flow speed changes suddenly and becomes subsonic. In the case of a nozzle, if the flow velocity is supersonic before entering the nozzle, it will experience a normal shock as it becomes subsonic inside the nozzle. In the case of the equation of continuity for an incompressible fluid, the speed of the fluid increases when the cross-sectional area of the flow decreases, which is observed when water flows from a hose into a narrow spray nozzle. Regarding the Bernoulli effect, the water can emerge from the nozzle against opposing atmospheric pressure due to the conservation of energy; as the velocity of the fluid increases, the pressure decreases, which allows the fluid to emerge even against higher external pressure.