Acore plug has 21% porosity as determined using a boyle’s law porosimeter. when it was dry, the core weighed 238.00 g. when the outside of the dry core was lightly coated with paraffin, it weighed 249.51 g. the density of the paraffin was 0.896 g/ cm^3 . when the coated core was immersed in distilled water, it displaced 124.87 cm3 of water. what is the probable lithology of the core?

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

Determine whether or not it is possible to compress air adiabatically from k to 140 kpa and 400 k. what is the entropy change during this process?