Calculate the minimum required section modulus if the allowable bending stress is 26 ksi.

part4: below, fill in the missing portions of the beam shape designations for the most economical w10, w12, w14, w16, and w18 shapes that are acceptable for this case. also, enter the corresponding section modulus for each case.

part 5
choose the most economical w shape for this beam. select only from the w10, w12, w14, w16, and w18 shapes that were considered in part 4. if you have more than one choice with the same weight, choose the shorter shape.

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?

Afluid flows with a velocity field given by v=(x/t)i.. determine the local and convective accelerations when x=3 and t=1.

Draw the engineering stress-strain curve for (a) bcc; (b) fcc metals and mark important points.