Recent content by ghelman

No sweat. Thank you for the help so far!

Sorry about putting the thread in the wrong place. I will be sure to put it in the right place next time. Ok, so since B(x,r) is a subset of B(x',r'), we know that x is an element of B(x',r'). This implies that d(x,x') < r'. But we need d(x,x') < r' - r I'm not exactly sure how to...

As stated, the problem is to prove B(x,r) is a subset of B(x',r') if and only if d(x,x')<r'-r, where d is a measure function. The proof going one direction seems pretty simple, but I can not figure out the other direction Attempt at answer <= Assume d(x,x') < r'-r. Assume a is an...

So would I assume that the system is in equilibrium and use the vapor pressure as the partial pressure in Henry's Law? If I did that then how would I use the given concentration of 500 ppbv? Or am I supposed to plug in the given concentration and solve for the partial pressure? But then what...

I can probably find an article with a Henry's law constant, but if I solved it that way, how would that make use of the given concentration? Also, how would I solve part b?

I got the vapor pressure from a research article. We are allowed to look up any values we think we may need. Given that, what will we need to know in order to solve the problem?

Hmmmm...but how would using Henry's Law make use of the given concentration in the air?

Hi all, I need to solve this problem for my environmental chemistry class. It is supposed to be a "review" problem of concepts from analytical and gen. chem. but I certainly do not know how to do it. Homework Statement If you work at the wastewater treatment plant, you are exposed to...

It was always my understanding that math professor positions are extremely competitive, and that there were many more phds looking for these jobs than there are positions. I would not be that confident in my ability to get a position if that were true. Are math professor jobs not as competitive...

I am currently a sophomore engineering major thinking of switching to a math major. Math is my favorite subject, and I would like nothing more than to switch majors. However, I am a hesitant to switch because of the nature of most math careers that I know of. It seems like most math majors end...

Ok, I understand now. Gib Z, you clarified things very well. Thank for the help guys.

Hi all, I am having a little trouble understanding one of the concepts presented in my calculus class. I do not understand how the endpoints of an open interval can be differentiable. My teacher says that the endpoints of a closed interval can not be differentiable because the limit can not...