Given the potential one-foot thick slope failure along the circular arc (R = 300 ft, 91.44 m) shown in the sketch, the data in Table 2.14, a slope height = 120 ft (36.6 m); slope angle = 29◦, specific weight = 95pcf (15.0kN/m3), cohesion = 367 psf (17.6 kPa), and angle of internal friction= 16◦, find:
1. Seismic force on slice 7, if the seismic coefficient is 0.15;
2. Water force at the bottom of slice 7;
3. Force safety factor of slice 7 alone taking into account the seismic and water forces;
4. Safety factor for the considered slip surface with no seismic or water forces acting.