Recent content by itsagoal89

i also tried not converting it, and got a beast of a problem when i used l'hospital

kurt, rln(r^2) is a dream to solve. but converting the "r*(cos+sin)" to just the r is where you are losing me. i don't understand what you mean by "bound each by 1" this is what i am picturing when you say that -1=<cos=<1 -1=<sin=<1 yet i don't know how ^that helps at all. wr or do you...

yeah, I can't figure out part (h) either, any ideas? Let Ω = R2 \ {(0,y); y ≥ 0}. Find a closed form formula for the potential of F on Ω. I don't even know where to start with this one

ok yea, for c its 2pi, and d its zero, so g) i put 0=<t=<2pi. or wait, your saying, that since it doesn't pass through, it either encloses, or it doesnt,. so there are 2 possible answers, 0 and 2pi, 2pi if it is enclosed, 0 if it is not enclosed?

modtor, for g) when you integrate it without any parameters you get just t as the indefinite answer,, does that mean all possible values are between 0 and 2pi or if not, than what?

i hate the squeeze theorem. i am never going to use it again after calc3, i had a teacher ruin it for me, KURT- r -> 0 good call, i figured that part on my owner about five minutes after. but i don't know if its just my awful teacher, but i am not seeing what you are saying in "you can...

yaaaa peter SHI!

where Vector Field F=(-y/(x^2+y^2),x/(x^2+y^2)

compute the integral of ...i can't find the integral symbol, but is the standard integral sign with a circle in the middle of it and a c to the bottom right of it. F*dr where C is an arbitrary closed smooth contour that does not enclose the origin.

thanks kurt, but i don't know how i would, what would (x,y)->(0,0) change to? and i get stuck here... lim (r(cos(a)+sin(a))*ln(r^2) xy->(0,0)

compute the limit lim as x,y --> (0,0) of (x+y)*ln(x2+y2) i would use polar coordinates if (x+y) was (x^2+y^2) but that not being the case is messing with me. and than another one is the same parameters, but of (x^2*y)/(x^4+y^2). for this one i attempted to do the partial deriv of both x...

Good advice, i did, So, as the DLS machine is on it measures particle size over time correct? Do i keep measuring over time to see when the value strays from the norm?

And as i am still studying and only a sophomore engineer/physicist, could you please dumb this down, "If you trace the autocorrelation of laser light scattered from your sample it will show fluctuations depending on your particle size distribution."

That is a phenomenal concept Because the leathers/polypropelenes are what i have the most samples of. I was looking a "Wyatt" instruments and didn't find any good candidates. Or you i just have to analazye the graphs after numerous trials? thank you for your reply by the way, very intelligent!

I am interested in how PSD (particle size distribution) affects the transmittance of a material and I am trying to find an accurate process to measure it so that I can test and gather data on how it affects it. I don't know if transmittance is the proper word for what i want to study, but all...