A circular steel bar is axially loaded. It has a diameter of 2 in., a modulus of elasticity of 29x10^3ksi, and a shear modulus of 11.6x10^3ksi. If the rectangular rosette attached on the bar records the strains (all e's are supposed to be epsilons and all angles are measured from the x-axis) ea = 768x10^-6 in./in. (25 degrees), eb=-148x10^-6 in./in.(70 degrees) and ec=-68x10^-6 in./in. (115 degrees), when the load F is applied, determine load F.