The following are cross-section notes for a transition from cut to fill. The roadbed is 12 m wide in cut and 14 m wide in fill. Side slopes are 1:2. Compute volumes of cut and fill by the average end area method or pyramid volume as appropriate. Find the net amount of waste or borrow, allowing 12% shrinkage for material excavated and placed in embankments. Borrow should be expressed in fill meters and waste in cut meters.

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?