1.a) Show that the c/a ratio (height of the unit cell divided by its edge length) is 1.633 for the ideal hcp structure.
b) Comment on the fact that real hcp metals display c/a ratios varying from 1.58 (for Be) to 1.89 (for Cd)
2.A 1200 ft. equal tangent crest vertical curve is currently designed for 50 mi/hr. A civil engineering student contends that 60 mph is safe in a van because of the higher driver’s eye height. If all other design inputs are standard, what must the driver’s eye height in the van be for the student’s claim to be valid?