An engineer was asked to estimate the elastic settlement of foundations at a project site. She/he used a Shelby Tube and collected a relatively undisturbed soil sample that measured 35 mm diameter and 70 mm long. She/he conducted a triaxial shear test applying major principal stress of 170 kPa (vertical), and minor principal stresses (horizontal) of 100 kPa, allowing drainage to measure reduction in the sample volume. The changed length of soil sample was 66.5 mm, and the reduction in volume was 3.72 ml (as measured by drainage from sample) Using the 3-D stress strain equation from your E MCH 213. Calculate (a) Modulus of elasticity and (b) Poisson's ratio.

The higher the astm grain size number, the finer the gran is. a)-true b)-false

Air inially occupying a volume of 1 m2 at 100 kpa, 27 c undergoes three internally reversible processes in series. process 1-2 compression to 500 kpa during which pv constant process 2-3 adiabatic expanslon to 100 kpa process 3-1: constant-pressure expansion to 100 kpa (a) calculate the change of entropy for each of the three processes. (b) calculate the heat and work involved in each process. (c) is this cycle a power cycle or refrigeration cycle?

Tom is having a problem with his washing machine. he notices that the machine vibrates violently at a frequency of 1500 rpm due to an unknown rotating unbalance. the machine is mounted on 4 springs each having a stiffness of 10 kn/m. tom wishes to add an undamped vibration absorber attached by a spring under the machine the machine working frequency ranges between 800 rpm to 2000 rpm and its total mass while loaded is assumed to be 80 kg a) what should be the mass of the absorber added to the machine so that the natural frequency falls outside the working range? b) after a first trial of an absorber using a mass of 35 kg, the amplitude of the oscillation was found to be 10 cm. what is the value of the rotating unbalance? c) using me-3.5 kg.m, find the optimal absorber (by minimizing its mass). what would be the amplitude of the oscillation of the absorber?