You put this rod under scanning electron microscope and you found a crack on the surface. You would like to determine the maximum allowable surface crack length by assuming that the applied tensile strength was a critical stress. Determine the maximum allowable surface crack length if the surface energy is 0.5 J/m2

Rank the six combinations of electric charges on the basis of the electric force acting on q1. define forces pointing to the right as positive and forces pointing to the left as negative. rank positive forces as larger than negative forces. q1,q2,q3 = positive(+) q1 = + q2 = + q3 = - q1 = + q2= - q3= + q1= - q2= + q3= + q1= + q2= - q3= - q1,q2,q3 = negative