Assume you are an observer standing at a point along a three-lane roadway. All vehicles in lane 1 are
traveling at 30 mi/h, all vehicles in lane 2 are traveling
at 45 mi/h, and all vehicles in lane 3 are traveling at 60
mi/h. There is also a constant spacing of 0.5 mile
between vehicles. If you collect spot speed data for all
vehicles as they cross your observation point, for 30
minutes, what will be the time-mean speed and spacemean speed for this traffic stream?

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.