Calculate the 17 year design esals for a highway section with 3,000 class 9 trucks per day traveling at the legal load limit (loaded trucks) and 2,000 class 9 trucks per day travelling with 62kn load on the front axle and 89kn on the tandem axles.

Assuming compressible flow of air and that the measurements are done at flagstaff a pitot static tube that gives the difference of total and static pressure measures 0.35 m of mercury. what is the velocity of air? assume the temperature to be 300k. (submit your excel or matlab calculation sheet)

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.

Brief discuss how the presence of dislocations in crystal structures can be an advantage and a disadvantage to engineer and designers.