Air flows through a device in which heat and work is exchanged. there is a single inlet and outlet, and the flow at each boundary is steady and uniform. the inlet flow has the following properties: flowrate 50 kg/s, t 25 °c, and velocity 150 m/s. heat is added to the device at the rate of 42 mw, and the shaft work is -100 kw (assume the efficiency is 100 %). the exit velocity is 400 m/s calculate the specific stagnation enthalpy (j/kg or kj/kg) at the inlet, and use the 1st law to calculate the specific stagnation enthalpy at the exit. assume constant cp1.0 kj/kg -k. calculate the temperature of the air at the exit. was the assumption of constant cp a good one?

11548KJ/kg

10641KJ/kg

Explanation:

Stagnation enthalpy:

given:

cp = 1.0 KJ/kg-K

T1 = 25 C +273 = 298 K

V1 = 150 m/s

11548 KJ/kg

Using Heat balance for steady-state system:

Qin = 42 MW

W = -100 KW

V2 = 400 m/s

Using the above equation

10641 KJ/kg

c) We use cp because the work is done per constant pressure on the system.

answer:

science is the study of the nature and behavior of natural things and the knowledge that we obtain about them. a science is a particular branch of science such as physics, chemistry, or biology. physics is the best example of a science which has developed strong, abstract theories.

pseudoscience is a collection of beliefs or practices mistakenly regarded as being based on scientific method.

plz rate as brainliest