An engineer has invented a new type of 3D printable carbon fiber reinforced polymer. They 3D printed a carbon fiber reinforced bar. The bar has a length of 7.5mm and a cross section area of 5mm^2. They put the bar under uniaxial tensile test and obtained the datasheet (can be found CEE 108, Spring 2021 in the Folder of Week 2 at CCLE). Please (1) determine the linear elastic modulus of this material. (hint: plot the curve, locate the linear section and find the slope of that section). (2) find the elongation at an axial tensile loading of 200N.

The temperature of air decreases as it is compressed by an adiabatic compressor. a)- true b)- false

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?

Water at 70°f and streams enter the mixing chamber at the same mass flow rate, determine the temperature and the quality of the exiting stream. 0 psia is heated in a chamber by mixing it with saturated water vapor at 20 psia. if both streams enters the mixing chamber at the same mass flow rate, determine the temperature and the quality of the existing system.