You are designing a drier that must evaporate 200 lb/h of h2o from sludge by using air. air at 70°f and 50% relative humidity is drawn into the drier and it leaves at 140f and 70% relative humidity. how much volume of dry air needs to be used for this operation?

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.