# Search results for query: *

1. ### Understanding the incomplete gamma function

Thus, instead of just a -t in the exponent, there is now a constant with it! So is this legal?
2. ### Understanding the incomplete gamma function

I know that the gamma function (from 0 to infinity): \int e-t tx-1 dt = \Gamma(x) and that the relation exists... \int e-ut tx-1 dt = 1/ux \Gamma(x) Now for the lower bound incomplete gamma function... I see that from http://people.math.sfu.ca/~cbm/aands/page_260.htm (equation...
3. ### Arc Circle Volume

V = \int_0^{2\pi}\int_0^\alpha\int_0^a \rho^2\sin{(\phi)}d\rho\ d\phi\ d\theta = \frac{2\pi a^3}{3}(1 - cos{(\alpha)}) Reason why I ask was I am just evaluating your limits... I see for outermost integral, limits are from 0 to 2 \pi\ . makes since, because were rotating around 360 degrees...
4. ### Arc Circle Volume

Just to clarify: \phi\ , \theta\ , \rho\ are respectively: elevation angle, azimuth angle, and radius...
5. ### Arc Circle Volume

Did you derive this triple integral?
6. ### Arc Circle Volume

Thanks for the help guys. Actually, my math background goes to ODE - so it makes since, I just assumed a simpler method existed. I am going to look in my multivariable calculus text to revitalize my head for this approach...
7. ### Arc Circle Volume

Sorry. What I am trying to find is the volume of a segment of a sphere. I can find the area in 2-D space but cannot figure out a formula for volume for 3-D space.
8. ### Arc Circle Volume

Homework Statement Trying to either derive or find a formula for the volume given by the space carved out from the area between an arc and the center of a circle. Essentially, the area between an arc and the center of a circle rotated 360 degrees, almost a cone shape with the upper boundary...
9. ### Schools Applying to grad school, how do i look?

Apply to a grad school (not physics, but atmospheric science or GIS) and my GPA as of now is 3.22. Took the General GRE and got a 620 math, 460 verbal :-/... Talk to my prof he thinks I should be able to. My GPA should Inc. due to less gen ed classes I have to take. But I don't know if I should...
10. ### Schools Preparing for the GRE: Timing, Resources, GPA Considerations

Im graduating this spring and I am going to apply to some graduate schools and have to take the GRE's. So.. When is a good time to take them and how much in advance should you prepare for them, like a good rule of thumb? I was planning early september... Too soon/late? Also, anyone know a site...
11. ### Catching up in math after calc 1 failure.

take pre-calc instead of calc. IT seems to be the obvious choice, if your not prepared for calc, then you make sense to drop down a level. IF not prepared for that go down to college algebra.
12. ### Explain how to do U-sub

i laughed out loud when i clicked that
13. ### Explain how to do U-sub

http://en.wikipedia.org/wiki/U-substitution
14. ### Integrating Factor ODE Fix

Got the eqn dy/dx=x(1-y) and it can be solved both linear and separable methods.(Linear method being using a integrating factor) Problem I am having is that with this two methods i get two different (yet similar answers) and was wondering if you can see my problem with this two methods I am...
15. ### Mixing involving diffy q

fluid with 5mg/cm^3 of drug enters bloodsteam at 100cm^3/hr, drug is absorbed by body tissue or otherwise leaves the bloodstream at a rate proportional to the amount present with a rate constant of .4(hr)^-1. so assuming the drug is always uniformly distrbuted throughout the bloodstream, the...
16. ### Help solving y'=y(3-y)

It was a brain fart ease up on me
17. ### Help solving y'=y(3-y)

how do you change a minus sigh into a exponent, I am lost when you said that.
18. ### Help solving y'=y(3-y)

After my partial fraction decomposition I got: -ln((y-3)/y)/3=x+c?
19. ### Help solving y'=y(3-y)

just started ordinary differential equation class, and i have to find the general soln of the eqn: y'=y(3-y)... just started so i only know of the method of separation of varibles. Thought of multiplying the y through so it becomes: y'=3y-y^2 then do.. dy/dx=3y-y^2 then... I am stuck...
20. ### Partial derivatives review

its a TI calculator that does alot.
21. ### Partial derivatives review

its -2y^2-e^(-3z)*sin(5x-.75t)5 I THINK, butttt... i have a voyage 200 near me and when i check it, its giving me a error and I don't trust myself enough to think its right...
22. ### Partial derivatives review

Ok i got this problem... T(x,y,z,t)= -2xy^2+e^(-3z)cos(5x-.75t) taking the partial derivative with respect to x first, so i break the problem apart with the left and right sign of the addition side so i get... -2y^2 for the left side and then am stubling on the right side, I am think just...
23. ### Schools Graduate Schools in Canada for Meteorology and any other releated sciences

Is there a site with a list of Canada based graduate schools, I want to pursue graduate school not in the US but Canada. Also my GPA is around 3.1 but it is just the start of my junior year and I plan to improve on that to around 3.3 at least, so I hope its still possible for me to go since my...
24. ### Need Help to Improve Test Grades

Are you scared to find out the answer to that question?

langleys/min
26. ### Unit conversion problems

:devil: I have 3 unit conversions and they are not coming out right... what am I doing wrong if you can spot it: 1)1.64ly/min to SI Units: 1ly/min=697.5W/m^2 1144.6W/m^2 but how do you get it with just the oringinal SI units... 2)2.3E27carats/parsec^3 to SI: 2.3E27carats/parsec^3 *...
27. ### Unit conversion

also I know the SI for what langley is used for is cal/cm so would the SI be (cal/cm)/s?
28. ### Unit conversion

i have to convert radiation flux density measured from the sun that's 1.64 langleys/min. Easy no? Well, I can't find what the SI unit for radiation flux density is, and its not on google. Anyone know just what the units is [NOT the conversion]
29. ### Gauss' Law and electric flux

the LaTeX Graphic is not loading i can't see what you said
30. ### Gauss' Law and electric flux

so do the surface integral of E*dA = |E|times area, area = s^2?
31. ### Gauss' Law and electric flux

so would that be |E|= sigma / 2Eo = (Q/Area of plane)/2Eo? It didnt work ...
32. ### Gauss' Law and electric flux

I got a cube withe edge length 1.4m and has a uniform electric field, i have to find the electric flux throught the right face for the following fields. A) 2.00i B)-3.00j answer for a) is 0, i think because its uniform and all the inward and outward contribuitions cancel but then why...
33. ### Calc 3 questions concerning Normal and Tangent unit Vectors

So I do the quotient rule to each of the components of T(t)? How did you get your answer for T'(t)?
34. ### Calc 3 questions concerning Normal and Tangent unit Vectors

heres is one problem i did, i photo'd it so i wouldn't have to worry about it... Am I doing it right? any problems can you see :-/ on like the 8th/9th line, I don't think I can do what I did... http://img130.imageshack.us/img130/1332/test076ze.jpg [Broken] Sooo
35. ### Can we get a Meteorology Board?

Just wondering. Its a science that use's a lot of Physics and Math
36. ### WilL I do good in calculus?

At my high school I had a bad case of "senioritis" and failed to do any work in my math classes (pre-calc) thinking that I would be fine... I was wrong, after getting to my university I took pre-calc again and did pretty badly and got a D-, though a lot of my classmates in the same major...
37. ### Maclaurin Series used to find associated radius of convergence Q

Sorry I ment to say in the book the radius of convergence is infinity, how is that possible seeing the result of the ratio test gives you L and it has to be less then 1? how to you get that radius of infinity?
38. ### Maclaurin Series used to find associated radius of convergence Q

Yeah i tried the ratio test, but the radius of convergence it sayed in the big is infinity, how is that possible as it has to be n < 1?
39. ### Maclaurin Series used to find associated radius of convergence Q

I have the Maclaurin series for cos (x), is their a way to find its radius of convergence from that? ALSO Is there a trick to find the shorter version of the power series for the Maclaurin series, I can never seem to find it so instead of the long series with each term but like E summation (the...
40. ### Quickie Ratio Test question

iiiiiiiiiii... my book doesn't say absolute value... so idk. I see what you mean if that's true. Why doesn't my book say that it says just that its decreasing or equal too...
41. ### Quickie Ratio Test question

I don't quite understand, the alternating series only works when An+1< or = to An, and in that series it doesnt, because An is negative and An+1 is postivie? Could you elaborate and how I would relate it to the series at 1/3?
42. ### Quickie Ratio Test question

Have to find the radius of convergence and interval of convergence, the series is (3^n x^n ) / (n+1)^2, did the ratio test and found the radius of convergence to be the 1/3. now for finding the interval of convergence I plug in -1/3 and 1/3 into x and find out if it converges or not For...
43. ### Question about error theorem for simpsons rule

it is: E=|I-Sn|>= (k4 (b-a)^2 )/ (180 n^4) I know what all of the parameters mean except I, what is it again? It can't be the integral as that's why were using simpsons rule so is it a guess or?:blushing:
44. ### Series/Convergence help

help determining where the series here is abs. convergent. its Sin(2n)/n^2, i thought about the ratio test but it gets nasty, is there a easier way? nm, i think it is convergence if I use the comparison test? Sound right? what about (-3)^n/n!, i used the ratio test, and got 0, which means it...
45. ### Determining Monotonicity & Bounds in Sequences

Need help clairfying some stuff. How do you determine if a Sequence is not monotonic? Also if its just inc. or dec. its monotonic? For example. Seq=An= 1/(2n+3) First 4 terms are {1/5,1/7,1/9,1/11,...} So its decreasing...and I guess monotonic? And how would you determine if that sequences...
46. ### Roller coaster problem

Roller coaster Vel. Initial=10m/s, Height initial=100m, and the mass of the coaster is 1000kg all at the starting point (*). Have to find the speed of coaster at point A, point A's height is the same as the starting points, b is 1/2 of a's height, c's height is zero. Coaster kinda looks like...

yes it was
48. ### Percent Difference

Which is ABS( A - B) / A * 100% = ANS Anyway to do it without A? My proff says we should know it or be able to figure it out?
49. ### Integral Average Question

it works from 0 to 12, thanks, don't know why i thought 10 DUH
50. ### Integral Average Question

i tried 9 to 21 and it didnt work before...