The effective stress parameters for a fully saturated clay are known to be c′=15 kn/m2 and φ′=29°. in an unconsolidated-undrained triaxial test on a specimen of the same clay the all-round pressure was 250 kn/m2 and the principal stress difference at failure 134 kn/m2. what was the value of pore water pressure in this specimen at failure?

Liquid flows at steady state at a rate of 2 lb/'s through a pump, which operates to raise the elevation of the liquid 100 ft from control volume inlet to exit. the liquid specific enthalpy at the inlet is 40.09 btu/lb and at the exit is 40.94 btub. the pump requires 3 btu/s of power to operate. if kinetic energy effects are negligible and gravitational acceleration is 32.174 tt/s, the heat transfer rate associated with this steady state process is most closely 1)-2,02 btu/s from the liquid to the surroundings 2)-3.98 btu/s from the surroundings to the liquid. 3)-4.96 btu/s from the surroundings to the liquid. 4)-1.04 btu/s from the liquid to the surroundings.