Engineering, 24.11.2020 22:00, JeroMii
The use of seat belts in cars has significantly reduced the number of crash
fatalities. Which statement best explains how societal demand guided the
development of seat-belt technology?
A. Engineers improved the design of seat belts because consumers
wanted them to be easier to use.
B. Car manufacturers recognized the dangers of not wearing seat
belts in cars and then lobbied the government to make laws that
required their use.
C. Engineers developed seat-belt technology and then began a public
awareness campaign to educate people on how they could be
used to make cars safer.
D. When new seat-belt technology became available, consumers
began to demand their inclusion in all new cars.
Answers: 3
Engineering, 04.07.2019 18:10, abdirahmansoloman
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?
Answers: 1
Engineering, 04.07.2019 18:20, krojas015
Asolid cylinder is concentric with a straight pipe. the cylinder is 0.5 m long and has an outside diameter of 8 cm. the pipe has an inside diameter of 8.5 cm. the annulus between the cylinder ad the pipe contains stationary oil. the oil has a specific gravity of 0.92 and a kinematic viscosity of 5.57 x 10-4 m2/s. most nearly, what is the force needed to move the cylinder along the pipe at a constant velocity of 1 m/s?
Answers: 3
Engineering, 04.07.2019 18:20, 21megoplin
How much power could a wind turbine produce if it had the following specifications? cp = 0.45 -d=1.2kg/m3 d=50m v 5m/s
Answers: 2
The use of seat belts in cars has significantly reduced the number of crash
fatalities. Which state...
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