a. Convert 20 pound per square inch to pound per square foot. b. Tensile force of 5N acts on a 2x2 mm (cross section) rod. What is the stress in N/m2? c. A shear stress of 100 kPa acts, what is the force in Newton if the area is 1 m?? d. A block made of concrete with area dimensions (100 mm x 80 mm). What is the maximum load (mass) it can support in newton? The allowable stress is 40MPa. e. Find the area (in m2) if the allowable shear stress is 100MPa and the force is 20,000 N