An orthogonal cut 3.18 mm wide is made at a speed of 33.5 m/min and feed of 0.25 mm/rev with a high-speed steel tool having a rake angle of 18o. The chip thickness ratio is 0.58, the cutting force is 1379 N, and its associated normal force Ft is 356 N. Determine the Chip thickness Shear plane angle Magnitude of the resultant force Coefficient of friction on the face of the tool Magnitude of the friction force and associated normal force Magnitude of the shearing force and associated normal force Specific energy

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?