![subject](/tpl/images/cats/User.png)
Engineering, 16.10.2020 14:01 bigboy43
A horizontal structure consists of an 10-mm-thick layer of copper and an 10-mm-thick layer of aluminum. The bottom surface of the composite structure receives a heat flux of 100 kW/m^2, while the top surface is exposed to convective conditions characterized by h= 40 W/m^2·K, T[infinity] =25°C. The initial temperature of both materials is Ti, A = Ti, B=25°C, and a contact resistance of 200 × 10^−6 m^2·K/W exists at the interface between the two materials.
Required:
a. Determine the times, both in seconds, at which the copper and aluminum each reach a temperature of 90°C. The copper layer is on the bottom.
b. Repeat part (a) with the copper layer on the top.
![ansver](/tpl/images/cats/User.png)
Answers: 1
![](/tpl/images/ask_question.png)
![](/tpl/images/ask_question_mob.png)
Another question on Engineering
![question](/tpl/images/cats/User.png)
Engineering, 03.07.2019 15:10
Heat is added to a piston-cylinder device filled with 2 kg of air to raise its temperature 400 c from an initial temperature of t1 27 cand pressure of pi 1 mpa. the process is isobaric process. find a)-the final pressure p2 b)-the heat transfer to the air.
Answers: 1
![question](/tpl/images/cats/User.png)
Engineering, 04.07.2019 18:20
Water vapor initially at 10 bar and 400 °c is contained within a piston-cylinder assembly. the water lost heat to the surrounding according to isochoric (iso-volumetric) process until its temperature is 150 °c. the water is then condensed isothermally to saturated liquid. for the water as a system, calculate the work in kj/kg
Answers: 2
![question](/tpl/images/cats/User.png)
Engineering, 04.07.2019 19:20
Brief discuss how the presence of dislocations in crystal structures can be an advantage and a disadvantage to engineer and designers.
Answers: 3
![question](/tpl/images/cats/User.png)
Engineering, 05.07.2019 10:10
What is the correct way to measure the overall length of a boat? measure from the tip of the bow to the highest point on the gunwale. measure from the tip of the bow in a straight line to the stern of the boat. measure from the tip of the bow in a straight line to the back seat. measure from port to starboard at the boat's widest point.
Answers: 1
You know the right answer?
A horizontal structure consists of an 10-mm-thick layer of copper and an 10-mm-thick layer of alumin...
Questions
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/health.png)
Health, 08.10.2019 10:20
![question](/tpl/images/cats/geografiya.png)
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/istoriya.png)
History, 08.10.2019 10:20
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/ekonomika.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 08.10.2019 10:20
![question](/tpl/images/cats/obshestvoznanie.png)
Social Studies, 08.10.2019 10:20
![question](/tpl/images/cats/ekonomika.png)
![question](/tpl/images/cats/es.png)
Spanish, 08.10.2019 10:20
![question](/tpl/images/cats/obshestvoznanie.png)
Social Studies, 08.10.2019 10:20
![question](/tpl/images/cats/mat.png)
Mathematics, 08.10.2019 10:20
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/obshestvoznanie.png)
Social Studies, 08.10.2019 10:20
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/himiya.png)
Chemistry, 08.10.2019 10:20
![question](/tpl/images/cats/en.png)