Consider a 0.8-m-high and 1.5-m-wide glass window with a thickness of 8 mm and a thermal conductivity of k 0.78 W/m · °C. Determine the steady rate of heat transfer through this glass window and the temperature of its inner surface for a day during which the room is maintained at 20°C while the temperature of the outdoors is 10°C. Take the heat transfer coefficients on the inner and outer surfaces of the window to be hl 10 W/m2 -°C and h2 40 W/m2 - °C, which includes the effects of radiation. - Glass 20°C• T -10°C h, = 10 W/m²-°C| h, = 40 W/m²-°C L=8 mm

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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.