1.3.5 Quiz: What Is Engineering? Question 2 of 5
Which statement describes a way in which society affects the development
of technology?
A. Better batteries let new electric cars go farther without recharging.
B. New computer models are designed to meet the need for accurate
weather forecasts.
C. Advancements in computers lead people to find more uses for
computers.
D. A person's lost limb can be replaced with an advanced robotic
limb.

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?

The drive force for diffusion is 7 fick's first law can be used to solve the non-steady state diffusion. a)-true b)-false

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.