Engineering, 23.09.2020 14:01 stussy44
3. Seals employ a 2 cm thick layer of fat (k = 0.18 W/m·K) to reduce heat loss to their environment. What is the thickness of a diver’s suit made of urethane (k = 0.023 W/m·K) to achieve the same level of insulation as the layer of fat in the seal? If the deep body temperature of a seal is 36.5°C and it has a surface area of 0.8 m2, calculate the conduction heat loss of this seal in 5°C water.
Answers: 2
Engineering, 04.07.2019 19:10
With increases in magnification, which of the following occur? a. the field of view decreases. b. the ambient illumination decreases. c. the larger parts can be measured. d. the eyepiece must be raised.
Answers: 1
Engineering, 04.07.2019 19:20
The process in which the system pressure remain constant is called a)-isobaric b)-isochoric c)-isolated d)-isothermal
Answers: 3
Engineering, 04.07.2019 19:20
Air enters a horizontal, constant-diameter heating duct operating at steady state at 290 k, 1 bar, with a volumetric flow rate of 0.25 m°/s, and exits at 325 k, 0.95 bar. the flow area is 0.04 m2. assuming the ideal gas model with k = 1.4 for the air, determine (a) the velocity at the inlet and exit, each in m/s, and (c) the rate of heat transfer, in kw flow rate, in kg/s, (b) the mass kg 0.3
Answers: 2
Engineering, 04.07.2019 19:20
Consider airflow over a flat plate of length l = 1.5 m under conditions for which transition occurs at le = 0.9 m based on the critical reynolds number, re,e = 5 x 10. evaluating the thermophysical properties of air at 400 k, determine the air velocity. (hint: use the tables to find the properties of air)
Answers: 3
3. Seals employ a 2 cm thick layer of fat (k = 0.18 W/m·K) to reduce heat loss to their environment....
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