[6] A circular light well of 5.0m external diameter and 0.80m steining thickness is embedded upto a depth of 15.0m in a uniform sand deposit. The angle of shearing resistance of sand and saturated unit weight are 30 and 21kN/m3 respectively. The well is subjected to a horizontal load of 1000kN and a moment of 5000kNm at the scour level. Assuming the well to be a light well, determine a) Allowable total equivalent resisting force due to earth pressure with a factor of safety =2.0 b) Determine the magnitude and point of application of maximum bending moment. c) Percentage change in earth pressure if the well is heavy and rotates about the base