Answer:
t = 2244.3 sec
Explanation:
calculate the thermal diffusivity
Temperature at 28 mm distance after t time = = 50 degree C
we know that
![\frac{ 50 -25}{300-25} = erf [\frac{28\times 10^{-3}}{2\sqrt{1.34\times 10^{-5}\times t}}]](https://tex.z-dn.net/?f=%5Cfrac%7B%2050%20-25%7D%7B300-25%7D%20%3D%20erf%20%5B%5Cfrac%7B28%5Ctimes%2010%5E%7B-3%7D%7D%7B2%5Csqrt%7B1.34%5Ctimes%2010%5E%7B-5%7D%5Ctimes%20t%7D%7D%5D)
from gaussian error function table , similarity variable w calculated as
erf w = 0.909
it is lie between erf w = 0.9008 and erf w = 0.11246 so by interpolation we have
w = 0.08073
![erf 0.08073 = erf[\frac{3.8245}{\sqrt{t}}]](https://tex.z-dn.net/?f=erf%200.08073%20%3D%20erf%5B%5Cfrac%7B3.8245%7D%7B%5Csqrt%7Bt%7D%7D%5D)
solving fot t we get
t = 2244.3 sec
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Answer:
a. SATA cable
Explanation:
A troubleshooting process could be as follows:
- <em>The Power supply</em> is working since it is possible to receive the <em>error message</em>.
- With no <em>OS available</em> is not possible to 'roll back the Windows update'.
Then, two alternatives remain:
- SATA cable.
- Hard drive.
In the reliability configuration of the components, <em>the hard drive depends on the SATA cable to work properly. </em>A faulty SATA cable would prevent the hard drive to work correctly. Then,<em> </em>a loosely SATA cable is the first thing to check before proceeding with the hard disk.
Additionally, a loosely SATA cable is also a common source of error messages like "OS not found" and it would be easier step to be discarded before continuing with a more demanding one like checking the hard drive.
