Answer:
q=2313.04![W/m^2](https://tex.z-dn.net/?f=W%2Fm%5E2)
T=690.86°C
Explanation:
Given that
Thickness t= 20 cm
Thermal conductivity of firebrick= 1.6 W/m.K
Thermal conductivity of structural brick= 0.7 W/m.K
Inner temperature of firebrick=980°C
Outer temperature of structural brick =30°C
We know that thermal resistance
![R=\dfrac{t}{KA}](https://tex.z-dn.net/?f=R%3D%5Cdfrac%7Bt%7D%7BKA%7D)
These are connect in series
![R=\left(\dfrac{t}{KA}\right)_{fire}+\left(\dfrac{t}{KA}\right)_{struc}](https://tex.z-dn.net/?f=R%3D%5Cleft%28%5Cdfrac%7Bt%7D%7BKA%7D%5Cright%29_%7Bfire%7D%2B%5Cleft%28%5Cdfrac%7Bt%7D%7BKA%7D%5Cright%29_%7Bstruc%7D)
Heat transfer
![Q=\dfrac{\Delta T}{R}](https://tex.z-dn.net/?f=Q%3D%5Cdfrac%7B%5CDelta%20T%7D%7BR%7D)
So heat flux
q=2313.04![W/m^2](https://tex.z-dn.net/?f=W%2Fm%5E2)
Lets temperature between interface is T
Now by equating heat in both bricks
![\dfrac{980-T}{\dfrac{0.2}{1.6A}}=\dfrac{T-30}{\dfrac{0.2}{0.7A}}](https://tex.z-dn.net/?f=%5Cdfrac%7B980-T%7D%7B%5Cdfrac%7B0.2%7D%7B1.6A%7D%7D%3D%5Cdfrac%7BT-30%7D%7B%5Cdfrac%7B0.2%7D%7B0.7A%7D%7D)
So T=690.86°C
Answer:
35 miles
Explanation:
When you are driving a truck that has an air brake system you have to keep in mind that when driving down a steep downgrade, the truck will automatically accelerate due to the inclination of the road, so in order to keep the speed to a controllable situation, you need to activate the service brake until you've reached the 35 miles per hour mark.
Answer & Explanation:
"The force <em>on a cutting tool</em> are 2600N vertically downward" sounds a little unusual, since most of the time, the tool is above the object to be cut in such a way that the force acting "ON the tool" is upwards. We will accept the statement as it is (downwards).
Since the two forces are acting at right angles to each other, the resultant can be found using Pythagoras theorem, namely
resultant = sqrt(2600^2+2100^2) = 3342 N (approx.)
The angle can be found using the arcTangent function, or
angle = arcTangent(2600/2100) = 51.07 degrees below the horizontal, since the 2600 N force is acting downwards.
Answer:
Hermetic compressors are ideal for small refrigeration systems, where continuous maintenance cannot be ensured.
Correct answers is montar