Two blocks A and B of weights W and Wa respectively rest on a rough inclined plane and are connected by a short piece of string as shown in the following figure. If the coefficients of friction between the blocks and the plane are respectively μ = 0.15 and μa = 0.25, determine the angle of inclination of the plane for which sliding will impend, and the tension in the string. Take W = Wa = 30 N.
Figure: Two blocks on a rough inclined plane