Acommercial passenger aircraft manufacturer would like to make aircraft fuselages with fibre-reinforced polymer composite materials. the required production rate is 10 units per month. the fuselage sections are 8m in diameter and 20m long. the composite fuselage structure must be manufactured with high quality and consistency to pass the stringent certification process. (a) what material system (matrix and reinforcement) would you select and for what reasons? (b) which material forms (e. g. fibre preform, prepreg etc.) and corresponding manufacturing process would you recommend? state the specific reasons for each recommendation.

The force on a cutting tool are 2600n vertically downward and 2100 horizontal. determine the resultant force acting on the tool and the angle at which it acts.

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?

Different types of steels contain different elements that alter the characteristics of the steel. for each of the following elements, explain what the element does when alloyed with steel.