
Concept explainers
Note: In the following problems, you will deal with both the International System of Units (SI) (N, kg, m, s, K) and the English Engineering System (lb, slug, ft, s,
Calculate
a. The stagnation point conditions given in Problem 7.1
b. Air at standard sea level conditions
(If you do not remember what standard sea level conditions are, find them in an appropriate reference, such as Reference 2.)
(a)

Specific heat at constant pressure and constant volume, specific internal energy &enthalpy at the given stagnation point.
Answer to Problem 7.2P
Specific heat capacity at constant pressure at stagnation point is,
Specific heat capacity at constant volume at stagnation point is,
Specific internal energy at the stagnation point is
Specific enthalpy energy at the stagnation point is
Explanation of Solution
Given:
Calculation:
Specific heat constant pressure can be given as,
Hence, the specific heat at constant pressure is
Specific heat constant volume can be given as,
Hence, the specific heat at constant volume is
Specific internal energy can be given as,
Hence, the specific internal energy is
Specific enthalpy can be given as,
Hence, the specific enthalpy energy is
(b)

Specific heat at constant pressure and constant volume, specific enthalpy and specific internal energy at the sea level.
Answer to Problem 7.2P
Specific heat capacity at constant pressure at sea level is,
Specific heat capacity at constant volume at sea level is,
Specific internal energy at sea level is
Specific enthalpy energy at sea level is
Explanation of Solution
Given:
Calculation:
Specific heat constant pressure can be given as,
Hence, the specific heat at constant pressure is
Specific heat constant volume can be given as,
Hence, the specific heat at constant volume is
Specific internal energy can be given as,
Hence, the specific internal energy is
Specific enthalpy can be given as,
Hence, the specific enthalpy energy is
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