4. (a) If w is humidity ration, o is relative humidity, Pw is partial pressure of water vapor in the air, Tis air temperature, and Pis the total pressure of 0.62198PW/(P- Pw). (b) If P=101.3kPa, o = 50%, w = 0.014 kg/kg dry air, find Pw, T, and Psat. (c) If P=101.3kPa, w = 0.008 kg/kg dry air, T= 25 °C, find p. (d) In problem (c), if Tincreases from 25 to 35 °C, find p. the air, derive that w = %3D

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Strain energy

The term strain indicates the variation in an object's length, area, and volume when the object is subjected to an external force. The external force may be of normal, shear, moment, torque, etc. The strain in an object depends on the types of external force and cross-section of the object. Mathematically, the evaluation of strain can be obtained with the help of elastic constants.