The tensile strength and number-average molecular weight for two polyethylene materials are as follows: tensile strength (mpa) number-average molecular weight (g/mol) 84 12,700 156 28,500 estimate the number-average molecular weight that is required to give a tensile strength of 188 mpa.

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)

Select any two (2) areas of applications of chain-drive. (clo4) a)-permanent lubrication necessary b)-hydraulic forklift truck operation c)-rigging and heavy moving materials d)-relatively high maintenance costs e)-costlier than belt drives

What is creep? what is stress relaxation?