A fine-grained soil has a liquid limit (LL) of 90 %, and a plasticity index (PI) of 51 %. Considering the water content (w) as large as 28 %.
a. Calculate the liquidity index (LI) and indicate the consistency of the soil. Moreover, classify this soil according to both the Unified Soil Classification System and the AASHTO system.

Amass of 1.5 kg of air at 120 kpa and 24°c is contained in a gas-tight, frictionless piston-cylinder device. the air is now compressed to a final pressure of 720 kpa. during the process, heat is transferred from the air such that the temperature inside the cylinder remains constant. calculate the boundary work input during this process.

Fluids at rest possess no flow energy. a)- true b)- false

Shafts are machine elements that are used to a) carry axial loads b) direct shear loads c) transmit power d) rotate at constant speed e) none of the above circular and square shafts subjected to the same torque under the same circum behave a) the same way b) almost the same way