1.A rectangular steel bar has cross-sectional dimensions of 12mm by 25mm and is 210 mm long. Assuming that the bar has pinned ends and is made from AISI 1141 OQT 1300 steel, compute the critical load when the bar is subjected to an axial compressive load.
2.A biodegradable wastewater is to be treated in a CMFR. The BOD5 reaction(removal) rate coefficient is 0.15/day. The CMFT has a 4000 gallon volume. What wastewater flowrate can be treated in this CMFR in order to remove 98% of the BOD5? What Volume of CMFR would be required to remove 92% of the BOD5 at the calculated flowrate?