2. A shaft 1.4 m long carries four eccentric loads A, B, C and D, spaced at 0; 0,45; 0,75 and 1.4 m from one end. The loads are 7.5; 11; 15 and 6 kg and the eccentricities 36; 48; 54; and 96 mm respectively. B, C and D are placed 60, 200 and 270 relative to A. The shaft is carried in bearing E and F, which are 0.175 m and 1.0 to the right of A respectively. a. Determine the maximum and minimum vertical forces on bearing, when the shaft rotates at 90 r/min, and [302.3 N; 118.3 N] b. find the maximum speed, at which the shaft may run, to ensure that the vertical component of the load F is always downwards. [136.1 r/min]