• A shaft 1.4 m long carries four eccentric loads A, B, C and D spaced at 0,0.45,0.75 and 1.4m from one end. The loads respectively -----, ----, ---- and ---- Kg (Take value of masses as `the roll numbers in the group) and eccentricities are 36, 48, 54 and 96 mm. The directions of eccentricities of B, C and D relative to A are 60, 200 and 270 degrees. The shaft is carried in bearings E and F which are 0.175 m and 1.0 from A, E being between A and B.
• Determine the maximum and minimum vertical forces on bearing F when shaft rotates at 90 rev/min.
•  What is the maximum speed at which shaft may run, to ensure that the vertical component of the load on F is always downwards?