The permeability of a semi-impervious soil was evaluated in a falling head permeameter whose head decreased from 40 to 15 inch (100 – 38 cm) in 5 min. The body diameter was 5 in (13cm), the standpipe diameter was 0.1 inch (0.3cm) and the sample length was 2 in (5cm). What was the permeability of the soil in SI units and US units?

On a average work day more than work place firs are reorted

Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.

Acompressor receives the shaft work to decrease the pressure of the fluid. a)- true b)- false