5. When a body is subjected to direct tensile stresses (?x and ?y ) in two mutually perpendicular directions, accompanied by a simple shear stress ?xy , then in Mohr's circle method, the circle radius is taken as
10. Two closely-coiled helical springs 'A' and 'B' are equal in all respects but the number of turns of spring 'A' is double that of spring 'B'. The stiffness of spring 'A' will be __________ that of spring 'B'.