FOR BRAINLIST HELP PLEASE IS A DCP A- Causes of the 13t Amendment

B- Reasons for Women's Suffrage

C- Reasons for the Freedmen's Bureau

D- Causes of the Plantation System

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?

Ahelical coil spring has a mean diameter of 50 mm, a wire diameter of 5.5 mm and is wound with a pitch of 10 mm. the spring steel has an ultimate strength of 1250 mpa. find the force needed to compress the spring solid and the wire stress in this condition. state whether the spring will return to its initial length.

Asteam engine isentropically expands 5 kg/sec of steam from 0.7 mpa, 220°c, the exhaust is dry and saturated. determine (the work of nonflow process (b) the final temperature, and (c) the work of a steady flow process