Athree-point bending test was performed on an aluminum oxide specimen having a circular cross section of radius 5.1 mm; the specimen fractured at a load of 2980 n when the distance between support points was 50 mm. another test is to be performed on a specimen of this same material, but one that has a square cross section of 14 mm in length on each edge. at what load would you expect this specimen to fracture if the support point separation is maintained at 50 mm?

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

Steel is coated with a thin layer of ceramic to protect against corrosion. what do you expect to happen to the coating when the temperature of the steel is increased significantly? explain.

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?