The initial piezometric head in a confined aquifer, which has a thickness of 11.6 m, is 85.7 m above sea level. A well with a radius of 0.5 m pumps at a constant rate of 1,240 m3/day. After the cone of depression has achieved equilibrium (i. e., steady-state), the piezometric heads at two observation wells 40 m and 95 m from the pumping well are measured as 78.9 m and 83.4 m above sea level, respectively. Also, the piezometric head in the pumping well during equilibrium remains at 46.6 m. Determine (a) the aquifer transmissivity, (b) the radius of influence of the pumping, and (c) the total well losses in and around the pumping well.

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

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?

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