1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Neporo4naja [7]
4 years ago
9

A heating cable is embedded in a concrete slab for snow melting. The heating cable is heated electrically with joule heating to

provide the concrete slab with a uniform heat of 1200 W/ m2. The concrete has a thermal conductivity of 1.4 W/m⋅K. To minimize thermal stress in the concrete, the temperature difference between the heater surface (T1) and the slab surface (T2) should not exceed 16°C (2015 ASHRAE Handbook—HVAC Applications, Chapter. 51). Formulate the temperature profile in the concrete slab, and determine the thickness of the concrete slab (L) so that T1 − T2 ≤ 16°C.
Engineering
1 answer:
Harman [31]4 years ago
6 0

Answer:

18.7 mm

Explanation:

Fourier's law for heat conduction on a plate is:

q = -k/t * ΔT

Where

q: heat conducted per unit of time and surface

k: thermal conductivity

t: thickness of the plate

ΔT: temperature difference

Rearranging:

t = -k/q * ΔT

t = -1.4/(-1200) * 16 = 0.0187 m = 18.7 mm (q is negative because it is heat leaving the plate)

The maximum thickness of the concrete slab is 18.7 mm.

You might be interested in
Click this link to view O*NET’s Wages and Employment section for Film and Video Editors.
vova2212 [387]

Answer:

much faster than average

Explanation:

did it on edge (2022-2032)

6 0
3 years ago
Information or signals entered into a computer system is
Virty [35]

<em>Logs.</em>

<em>Like data logs. Sometimes people make these logs to keep tabs on other people or to get important information put down somewhere that way it is saved and can be looked back upon later. Anytime someone makes an action on the computer, it makes a TMP file representing a log of what you want it to do before the computer quickly get's rid of the file.</em>

<em>-Ɽ3₮Ɽ0 Ⱬ3Ɽ0</em>

<em />

8 0
3 years ago
Based on these statements:
Evgen [1.6K]

Answer:

the third statement is true

Explanation:

given data

Lenovos cost more than Dells

Lenovos cost less than Apples

solution

we have given 1st statement that is express as

cost (Lenovo) > cost (Dell)     ..................1

and

2nd statement that is express as

cost (Lenovo) < cost (Apple)

so we can say it as

cost (Apple) > cost (Lenovo)       ......................2

and

now above Both equation 1 and 2 can be written as

cost (Apple) > cost (Lenovo) > cost (Dell)      .........................3

so we can say cost of Apples is more than the cost of Lenovos and the cost of Dells

so as that given 3rd statement is true

7 0
4 years ago
If gain of the critically damped system is increased, the system will behave as a) Under damped b) Over damped c) Critically dam
Ganezh [65]

Answer:

a) Under damped

Explanation:

Given that system is critically damped .And we have to find out the condition when gain is increased.

As we know that damping ratio given as follows

\zeta =\dfrac{C}{C_c}

Where C is the damping coefficient and Cc is the critical damping coefficient.

C_c=2\sqrt{mK}

So from above we can say that

\zeta =\dfrac{C}{2\sqrt{mK}}

\zeta \alpha \dfrac{1}{\sqrt K}

From above relationship we can say when gain (K) is increases then system will become under damped system.

7 0
3 years ago
Why do I eat Takis please
sammy [17]

Answer:

because they taste good :)

7 0
1 year ago
Read 2 more answers
Other questions:
  • a. A crude oil pipe’s radius is reduced by 5%. What is the corresponding percentage change in the pressure drop per unit length?
    8·1 answer
  • The direction of rotation of a dc series motor or a universal motor connected to a dc power source A) depends on the polarities
    15·1 answer
  • How an AK 47 gun was works​
    14·1 answer
  • As you discovered in lab last week, the advantage of CMOS logic is that no drain current flows through the MOSFETs when the outp
    14·1 answer
  • The input power for a thermostat is wired to the
    8·1 answer
  • Consider a modification of the air-standard Otto cycle in which the isentropic compression and expansion processes are each repl
    10·1 answer
  • Tony works as a Sorter in a processing factory. Which qualifications does he most likely have?
    10·2 answers
  • True or false the camshaft is always located in the engine block
    10·1 answer
  • Dalton needs to prepare a close-out report for his project. Which part of the close-out report would describe
    6·1 answer
  • New ventures that are based on strategic value, such as valuable technology, are attractive while those with low or no strategic
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!