Ask question

Ask question

All categories

3 years ago

10

Consider a 400 mm × 400 mm window in an aircraft. For a temperature difference of 90°C from the inner to the outer surface of th

e window, calculate the heat loss rate through L

1 answer:

True [87]3 years ago

5 0

Um I think the answer for this is 10l

You might be interested in

The car travels around the portion of a circular track having a radius of r = 500 ft such that when it is at point A it has a ve

stellarik [79]

Answer:

Explanation:

Given

velocity at A is $v=4\ ft/s$

For $r=500\ ft$

velocity is increasing at $\dot{v}=0.004t\ ft/s^2$

Tangential acceleration is given by

$a_t=\frac{\mathrm{d} v}{\mathrm{d} t}$

$a_t=0.004t=\frac{\mathrm{d} v}{\mathrm{d} t}$

$\int 0.004tdt=\int dv$

$\int dv=\int 0.004tdt$

$v=0.002t^2+c$

at $t=0\ v=4\ ft/s$

$4=0.002\cdot 0+c$

$c=4\ ft/s$

thus $v=0.002t^2+4$

Velocity in terms of Displacement is given by

$v=\frac{\mathrm{d} s}{\mathrm{d} t}$

$\Rightarrow \int ds=\int \left ( 0.002t^2+4\right )dt$

$\Rightarrow s=\frac{0.002t^3}{3}+4t$

When car has traveled $\frac{3}{4}$ th of distance i.e.

$s=\frac{3}{4}\times (2\pi r)=\frac{3\pi r}{2}$

$s=750\pi$

$750\pi =\frac{0.002t^3}{3}+4t$

$\Rightarrow \frac{0.002t^3}{3}+4t-2356.5=0$

on solving we get $t=139.23\ s$

Thus velocity at $t=139.23\ s$

$v=42.76\ s$

(b)Acceleration when car has traveled three-fourth the way of track

normal acceleration $a_n=\frac{v^2}{r}=\frac{(42.76)^2}{500}$

$a_n=3.658\ m/s^2$

Tangential acceleration $a_t at t=139.23\ s$

$a_t=0.556\ m/s^2$

Net acceleration $a_t=\sqrt{(a_n)^2+(a_t)^2}$

$a_n=\sqrt{(3.658)^2+(0.556)^2}$

$a_n=3.7\ m/s^2$

8 0

3 years ago

Choose the three questions that an engineer should ask himself or herself when identifying the need of a problem.

boyakko [2]

Answer:

What is the goal? What will a successful solution look like? What is it that the client expects me to accomplish?

Explanation:

5 0

3 years ago

Read 2 more answers

-0-1"<br> -0<br> -20<br> -15<br> -10<br> 0<br> -5

kari74 [83]

Answer:

what

Explanation:

what is that

3 0

4 years ago

3) What kind of bridges direct their load along it's curve and into the

AlladinOne [14]

Explanation:

suspension is the answer

8 0

3 years ago

Give what you now know about the transportation industry, describe in 50 words or less some key issues which are likely to limit

brilliants [131]

Moreover, these debates often focus on some topics at the expense of other equally important issues. For example, there is a legitimate concern ...

6 0

3 years ago