The drag of an oceanographic research submarine 9 m mated from wind tunnel tests with a scale model of length 1.5 m and wet- ted surface area 1.2 m2. the measured drag force in the wind tunnel is 7.9 n at a wind speed of 30 m/s and air temperature of 25°c. if the full-scale |submarine is deeply submerged in salt water at 15°c, at what speed can its drag be most accurately predicted? what is the best estimate of its drag at a speed of 2 m/s? can this estimate be refined by raising long is to be esti- lowering the or temperature in the wind tunnel?

What precautions should you take to prevent injuries when dealing with heavy loads?

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?

Assuming compressible flow of air and that the measurements are done at flagstaff a pitot static tube that gives the difference of total and static pressure measures 0.35 m of mercury. what is the velocity of air? assume the temperature to be 300k. (submit your excel or matlab calculation sheet)