Navigation list at the bottom of the cw_home. html page is a navigation list with the id #bottom containing several ul elements. sofia wants these ul elements laid out side-by-side. open the cw_styles. css file and create a style rule for the bottom navigation list displaying it as a flexbox row with no wrapping. set the justify-content property so that the flex items are centered along the main axis. be sure to include the -webkit browser extension in all of your flex styles. define flex values for ul elements within the bottom navigation list so that the width of those elements never exceeds 150 pixels but can shrink below that value.

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?