9.4. An unconfined aquifer with a specific yield of 0.20 is used as a water supply for the ir- rigation of farm land. The recharge area of the aquifer is the same area as the irri- gated area. The recharge is limited to 76 mm (3.0 in.) per year. The saturated thick- ness of the aquifer is 15.2 m (50ft). How many years will the water supply last if 254 mm (10.0 in.) of water per year is pumped from the aquifer for irrigation

When using the ohmmeter function of a digital multimeter, the leads are placed in what position relative to the component being tested? a. parallel b. control c. series d. line

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.

If a particle moves along a path such that r : (3 sin t) m and ? : 2t rad, where t is in seconds. what is the particle's acceleration in m/s in 4 seconds? a)- 16.43 b)- 16.29 c)- 15.21 d)- 13.79