A railroad crossing with a passive control is formed by a 2-lane highway with a design speed of 45 mph and a railroad track with trains traveling 95 mph. Determine the minimum distance a building should be placed from the centerline of the tracks to ensure safe crossing of an approaching vehicle if the building is located 150 ft from the center line of the right lane of the highway.

Plot schematically the tensile stress versus strain curves for a typical thermoplastic material at a temperature below its glass transition temperature (tg and at a temperature above its tg, respectively. do the same for a typical thermosetting material. list in a table any differences or similarities between the two materials at t> tg and t < tg, respectively, and relate them to the structures of the two types of polymers