The following information is provided for the initial mix design: Cement = 700 lbs Coarse Aggregate (OD) = 1,710 lbs Absorption = 1.0% Moisture Content = 1.90% Fine Aggregate (OD) = 1,170 lbs Absorption = 0.90% Moisture Content = 5.0% Water = 294 lbs 1. Calculate the adjusted coarse aggregate batch weight? 2. Calculate the adjusted fine aggregate batch weight? 3. Calculate the adjusted water batch weight: 4. The

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 drive force for diffusion is 7 fick's first law can be used to solve the non-steady state diffusion. a)-true b)-false

Air is compressed isentropically from an initial state of 300 k and 101 kpa to a final temperature of 1000 k. determine the final pressure using the following approaches: (a) approximate analysis (using properties at the average temperature) (b) exact analysis