Air (γ = 1.4, r = 287 j/kg-k) enters a device (station 1) at temperature 400 k, pressure 150 kpa and velocity 150 m/s. in the device, the heat added per unit mass to the air is 2.5(105 ) j/kg, and the work done by the air (per unit mass) is 105 j/kg. questions: (a) what are the stagnation temperature and the stagnation pressure at the device entry (station 1)? {ans.: 411.2 k, 165.2 kpa} (b) what is the stagnation temperature at the device exit (station 2)? {ans.: 560.5 k} (c) can the stagnation pressure at the device exit be found with the given data? (d) determine the mach number of the flow at station 1 of the device of problem 1. is the flow compressible?

hèllo, sorry i really need some more points so if you need this qustion answered than retype it

d₁ = displacement of tern from arctic to antarctic = 11000 miles

d₂ = displacement of tern from antarctic to arctic =   - 11000 miles

d = total displacement for the journey

total displacement for the journey is given as

d = d₁ + d₂

d = 11000 + (-11000)

d = 0 miles

t₁ = time of travel from arctic to antarctic = 3 months = 3 x 30 days = 90 days

t₂ = time of travel from antarctic to arctic = 3 months = 3 x 30 days = 90 days

t = total time of travel

total time of travel is given as

t = t₁ + t₂

t = 90 + 90

t = 180 days

average velocity is given as

average velocity = total displacement/ total time

v = d/t

v = 0/180

v = 0 miles/day