In an undrained triaxial test on a soil specimen the constant cell pressure was 200 kpa. when the piston load was 320 n the length of the specimen was 65 mm. if the original length and diameter of the specimen were 78mm and 38mm respectively, determine at the above piston load:
a) cross-sectional area of the specimen.
b) deviator stress.
c) major principal total stress.
d) maximum shear stress.

Asolid cylinder is concentric with a straight pipe. the cylinder is 0.5 m long and has an outside diameter of 8 cm. the pipe has an inside diameter of 8.5 cm. the annulus between the cylinder ad the pipe contains stationary oil. the oil has a specific gravity of 0.92 and a kinematic viscosity of 5.57 x 10-4 m2/s. most nearly, what is the force needed to move the cylinder along the pipe at a constant velocity of 1 m/s?