Combustion gases at T [infinity] , 1 = 2500°C are separated from a liquid coolant at T [infinity] , 2 = 150°C by a composite wall composed of a L A = 15-mm thick layer of beryllium oxide on the gas side and a L B = 22-mm thick slab of stainless steel (AISI 304) on the liquid side. If the contact resistance between the oxide and steel is R t , c = 0.03 m2·K/W, find the rate of heat loss per unit surface area of the composite wall. The gas convective coefficient is h 1 = 75 W/m2·K while on the liquid side is h 2 = 1000 W/m2·K.

Afoot bridge is made as a simple deck, 4 m long, with a cross section 2 m (wide) and 20 cm thick, and made of wood. the deck is supported at the two ends. the maximum load allowable on the bridge is 10 tons, provided it is uniformly distributed on the deck. to sense this load, a strain gauge is placed at the center of the bridge and its resistance is monitored. if the sensor has a nominal resistance of 350 s2 and a gauge factor of 3.6, what is the reading of the strain gauge at maximum load? the modulus of elasticity for the wood used in the construction is 10 gpa.