Answer:
A.
Explanation:
Answer D seems too simplistic, and the question specifically mentions IT practices.
Question B doesn't seem right - college and high school students would likely be able to understand the principles as much.
Question C wouldn't be a good argument for a school board, and there's not a lot of evidence that backs it up.
Therefore, A seems to be the best choice here.
Hope this helps!
Answer:
a) D = 4.88 * 10^(-14) m^2 / s
b) <em>t </em>= 1.1 hr
Solution:
a) Magnesium in Aluminum diffusion:
D = Do * exp(-Qd / RT)
= (1.2 * 10^(-4) m^2 / s) * exp ( - 130,000 / 8.31 * 723.15)
= 4.88 * 10^(-14) m^2 / s
D = 4.88 * 10^(-14) m^2 / s
b) The composition remains same at say the distance Xo:
(Cx - Co) / (Cs - Co) = Constant
Xo^2 / D_{550} * <em>t </em>= Xo^2 / D_{450} * 15
D_{550} * <em>t </em>= D_{450} * 15
(1.2 * 10^(-4) m^2 / s) * exp ( - 130,000 / 8.31 * 723.15) * <em>t</em>
(4.88 * 10^(-14) m^2 / s) * 15
by, solving for <em>t </em>we get:
<em>t </em>= 1.1 hr
So, the time required is 1.1 hr.
A troll's main goal is to provoke a reaction from people, so I'd say the best way to stop the troll in his or her tracks would be to log off and not give the troll any satisfaction.
Then again, the troll might see you logging off as a win because he or she made you rage quit, so maybe replying with a quick "no u" to troll the troll before logging off would throw them off. That being said, the long term solution would still be not responding at all. After a while of no reactions the troll would most likely get bored.
You can expect to develop an understanding of information systems, programming languages, information management and artificial intelligence, leaving your studies with the ability to apply your knowledge to solve problems.
