Ask question

Ask question

All categories

Amiraneli [1.4K]

3 years ago

6

Please help, I'm so confused I've never done this

1 answer:

olchik [2.2K]3 years ago

6 0

Answer:

yeah, your right its demand

You might be interested in

A 2-lane highway is to be constructed across a 6-ft diameter metal culvert which is oriented perpendicular to the highway center

kvv77 [185]

Answer:

Dude just like forget the highway and drive on the interstate bruh

Explanation:

5 0

4 years ago

What are the benefits of using the engineering design process? combining scientific knowledge and creativity in a rigid and stru

Trava [24]

Answer:

combining scientific knowledge, careful reasoning, and artistic invention in a flexible approach to problem-solving

Explanation:

7 0

4 years ago

For a steel alloy it has been determined that a carburizing heat treatment of 7 hour duration will raise the carbon concentratio

Aliun [14]

Answer:

18.6h

Explanation:

To solve this Duck's second law in form of Diffusion will be used.

Also note that since the temperature is constant D (change) will also be constant.

Please go through the attached files for further explanation and how the answer Is gotten.

6 0

3 years ago

Consider a plane composite wall that is composed of two materials of thermal conductivities kA 0.1 W/mK and kB 0.04 W/mK and thi

Triss [41]

Answer:

(a) 761.9 W

(b) 184.762 °C

(c) 55.238 °C

(d) see figure

Explanation:

Data

$k_A = 0.1 W/mK$

$k_B = 0.04 W/mK$

$L_A = 0.010 m$

$L_B = 0.020 m$

resistance, $R = 0.30 (m^2 K)/W$

$T_1 = 200 C$

$h_1 = 10 W/m^2 K$

$T_2 = 40 C$

$h_2 = 20 W/m^2 K$

area, $A = 2.5 m \times 2 m = 5 m^2$

(a)

The rate of heat transfer is calculated as

$Q = A \, \frac{1}{R_t} \, (T_1 - T_2) (1)$

Total flux resistance is

$R_t = 1/h_1 + 1/h_2 + L_A/k_A + L_B/k_B + R$

$R_t = (m^2 K)/10 W + (m^2 K)/20 W + 0.010 m (mK)/0.1 W+ 0.020 m (mK)/0.04 W + 0.30 (m^2 K)/W$

$R_t = 1.05 (m^2 K)/W$

From equation 1

$Q = 5 m^2 \, \frac{1}{1.05 (m^2 K)/W} \, (200 - 40) K$

$Q = 761.9 W$

(b)

Between ambient next to material A and material A heat flux is

$Q = A \, h_1 \, (T_1 - T_A)$

$T_A = T_1 - \frac{Q}{A \, h_1}$

$T_A = 200 C - \frac{761.9 W}{5 m^2 \, 10 W/m^2 C}$

$T_A = 184.762 C$

(c)

Between material B and ambient next to material B heat flux is

$Q = A \, h_2 \, (T_B - T_2)$

$T_B = \frac{Q}{A \, h_2}+ T_2$

$T_B = \frac{761.9 W}{5 m^2 \, 20 W/m^2 C} + 40 C$

$T_B = 55.238 C$

(d)

See figured attached

3 0

3 years ago

Como el desarrollo tecnologico ha sido evolutivo ejemplo ?

Ira Lisetskai [31]

Answer:

Evolución tecnológica es el nombre dado a una teoría de los estudios de ciencia, tecnología y sociedad, para describir el desarrollo histórico de la tecnología, explicitada por el filósofo checo Radovan Richta.[1]

Explanation:

espero te sirva

8 0

3 years ago