McKenzie likes to study alone in a room in their schools library, but it’s been in use the past few times she’s trying to study here. What should McKenzie do since she likes to study in that particular room? A work out schedule around its availability B stop going there and look for other options C complain to the library in charge that the room is being monopolized D Study elsewhere in so that others are done with the room

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?

Which of the following ziegler nichols tuning methods the response of the controller to a step input should exhibit an s-shaped curve? a)-open loop mode b)-closed loop mode c)-both modes (open & closed) d)-none of the modes (open & closed)

What is the heat treatment of metals? what is the benefit of it? why and how it's useful? answer in details, do not write by hand.