Calculate the heat loss per linear foot from a 3-in. steel pipe (id = 3.07 in.,od = 3.5 in., k = 25 btu/hr-ft-ºf) covered with 0.5-in thick insulation (k = 0.11 btu/hr-ft-ºf). the pipe transports a fluid at 300 ºf with an inner unit-surface heat transfer coefficient of 40 btu/hr-ft2-ºf and is exposed to ambient air at 80 ºf with an average outer heat transfer coefficient of 4.0 btu/hr-ft2-ºf.

The higher the astm grain-size number, the coarser the grain is. a)-true b)-false

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.

Air (c-1.006 kj/kg.k, r-0.287 kj/kg.k) enters a nozzle steadily at 280 kpa and 77°c with a velocity of 50 m/s and exits at 85 kpa and 320 m/s. the heat losses from the nozzle to the surrounding medium at 20°c are estimated to be 3.2 kj/kg. determine (a) the exit temperature and (b) the total entropy change for this process. solve this problem using constant specific heats.