If the stopping sight distance required to avoid colliding with a fallen boulder on a mountain pass is 800 feet, what is the likely grade of the mountainous segment of roadway. assume a perception-reaction time of 2.5 seconds, a design speed of 65 miles per hour, and an a/g value equal to 0.35. [use practical stopping distance]

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