Question

as nitrogen flows from a point a to a point b its temperature increases from 40 ∘f to 82 ∘f and its absolute pressure decreases from 30 psi to 25 psi.

Answer 1

20.65 kJ/kg K is the change for unit mass in internal energy between two points.

Initial pressure, P₁ = 30 psi

1 psi = 6894.76 Pa

30 psi = 206842.8 Pa = 206.8 kPa

At this pressure, nitrogen can be approximated as ideal gas without any problem.

Initial temperature, T₁ = 40°F

T₁  in °C = 4.4°C

Final temperature, T₂ = 90°F

T₂ in °C = 32.2°C

At the given conditions,

Specific heat at constant volume for nitrogen, Cv = 0.743 kJ/kg K

Change in internal energy,

ΔU = CvΔT

     = Cv (T₂ - T₁)

     =  0.743 kJ/kg K (32.2 - 4.4)

ΔU = 20.65 kJ/kg K

This is the change for unit mass in internal energy between two points.

The internal energy of a thermodynamic gadget is the power contained inside it. In an isolated gadget, the inner energy is steady. It is the strength necessary to create or put together the machine in its given inner country.

Internal energy is the sum of the potential strength of the system and the machine's kinetic power. The exchange in inner energy (ΔU) of a reaction is identical to the heat received or lost enthalpy change in a response when the reaction is administered at consistent strain.

Internal energy, in thermodynamics, is the property or country feature that defines the electricity of a substance inside the absence of consequences because of capillarity and outside electric, magnetic, and different fields. Internal energy is the sum of all varieties of molecular energies of a substance. In the study of thermodynamics, a commonly perfect fuel is considered a running substance. The molecules of an excellent fuel are mere mass factors that exert no pressure on one another.

Learn more about internal energy here:- brainly.com/question/25737117

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