1.Benefits associated with a project are $10,000 forever starting in year 1. The costs are $20,000 in year 0 and $20,000 in year 3. What is the B/C ratio at i=12% per year. First determine present worth for benefit and cost, respectively.
2.Rate the r values in increasing order of polyisocyanurate, expanded polystyrene, extruded polystyrene, glass fiberboards, lightweight concrete fill
3.A spherical gas container made of steel has a 5-m outer diameter and a wall thickness of 6 mm. Knowing the internal pressure is 350 kPa, determine the maximum normal stress and the maximum shearing stress in the container.