Afield test is conducted in an unconfined aquifer by pumping 1,300 ft3 /hr from an 8-inch-diameter well penetrating the aquifer. the undisturbed aquifer thickness is 46 ft. the drawdowns, measured at steady state at various locations, are tabulated below along with the associated semi-log plot of h2 vs. log r. determine the coefficient of permeability and how far away from the well you must be before the drawdown becomes less than 2.5 ft. r (ft) 0.33 40 125 350 s (ft) 6.05 4.05 3.57 3.05

If you were designing a bumper for a car, would you prefer it to exhibit elastic or plastic deformation? why? consider the functions of a bumper in both a minor "fender-bender" and a major collision.

Heat is added to a piston-cylinder device filled with 2 kg of air to raise its temperature 400 c from an initial temperature of t1 27 cand pressure of pi 1 mpa. the process is isobaric process. find a)-the final pressure p2 b)-the heat transfer to the air.

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.