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  1. RyanSchw

    Archived Quick circuit help/confirmation

    Homework Statement This should be a really easy circuit, but I need to see if I have it done right. 1V source, 1A source and a 1 Ohm resistor in parallel (forgot to write the 1 Ohm resistor on the image.) Find the power of each element.
  2. RyanSchw

    Find the integral of x/(x-6) with substitution

    For the first, I think more algebra is required than substitutions, you just need to be cleaver.
  3. RyanSchw

    Find the integral of x/(x-6) with substitution

    For the second problem, have you considered Polynomial long division, or do you have to use a substitution?
  4. RyanSchw

    Kirchhoff's Rules

    I'm still not sure that I know what I'm doing, but sticking to two loops helped; I have the correct answers now. This is such a headache, you guy have no idea how long Ive been stuck on that simple little problem, onto the next one. Thanks for the help.
  5. RyanSchw

    Kirchhoff's Rules

    Homework Statement Sorry for edit, accidentally posted. Circuit is show in my attachment. I have 3 loops with three unknown currents. 8 Ohms of resistance down the left side. 6 Ohms of resistance and a 4V battery down the center. 4 Ohms of resistance and a 12V battery down the right side. I...
  6. RyanSchw

    150th Anniversary of the Origin of Species[/youtube]" As some of you may be aware, the 150th anniversary of Charles Darwin’s Origin of Species is later this month, the 24th to be precise. In one week from today, a special abridged edition of the book...
  7. RyanSchw

    Curvature, More of a cross product question really.

    Actually, looking back over the problem, I think I assumed my 2 X 2 cross product was a cofactor expansion, where it should have been a constant. This would have allowed me to simplify that result and get the 128 \pi^3 I needed in the numerator. Cofactor expansion results in 0 \vec{i} +...
  8. RyanSchw

    Curvature, More of a cross product question really.

    The original question is: Find the curvature of \vec{r}(t) = 4cos(2 \pi t)\vec{i} + 4sin(2 \pi t)\vec{j} I have a solutions guide and found the curvature using K = \frac{||\vec{T}'(t)||}{||\vec{r}'(t)||} but I wanted to try the cross product method to see if it is...
  9. RyanSchw

    Curvature, More of a cross product question really.

    I've been using various methods of finding curvature, and using the forumla K=\frac{||\vec{r}'X \vec{r}''||}{||\vec{r}'||^3} I took the cross product of my two vectors and came up with (just assume this is correct, if my question isn't answered i'll post all related work)...
  10. RyanSchw

    News Mark your calendars

    I thought this was interesting, it's from ZapperZ's thread in general discussion. If you notice in the "Today's Top 20 Viral Videos" section just below," [Broken] is posted. She seems to have a...
  11. RyanSchw

    Fantastic Contraption

    This is a really awesome game. I wish I had the creativity of some of their forum veterans. Many of their members post solutions much like you guys are, check out a couple of solutions I found to level seven, I just made a long cart. =(
  12. RyanSchw

    LHC Rap!

    The sound is messed up on that one, sounds much better IMO and a great promotion for the LHC. I found it as a featured article on Yahoo and since I first saw it almost a million others have viewed it.
  13. RyanSchw

    Media Idiocy

    Here is part of that video on youtube.
  14. RyanSchw

    Air Cooler/Conditioner Question

    So, here’s the situation. My roommate and I live on the third floor of our apartment complex. As you walk into the building and begin to climb the stairs to the third floor you would notice a tremendous increase in temperature regardless of the weather. We have air conditioning but its not...
  15. RyanSchw

    Math/Physics Equation writing tool

    I use This site which allows you to play around with latex, and when it’s output you can copy and paste the image into MSword or whatever you have. Just another option.
  16. RyanSchw

    Indefinite Integral Homework

    I guess I phrased that poorly, I simply meant that the integral was in a specific form which can be dealt with easily when you look at the powers of Sin and Cos. In this case he would want to break up Sin^3(13x) using Sin^2(x) + Cos^2(x) = 1 because the power of the sine function is odd.
  17. RyanSchw

    Indefinite Integral Homework

    I don't think that you can simply use a u-substitution here, this appears to be a Trigonometric Integral to me, which has its own special rules. Since this is in the form of Sin^n(u)Cos^m(u) where m and n are both integers. Where does your book tell you to start? Hint: focus on m and n...
  18. RyanSchw

    Question about Integration

    You should surely be able to see why using u-substitution with the natural log will not work. My guess is that you are just given that anything in that form is going to be arctan and you will learn how to do this later on with Trigonometric Substitutions. Remember Sin^2(x) + Cos^2(x) = 1...
  19. RyanSchw

    Good names?

    Perpetual motion Squad. It's more physics related than math and meant to be a joke. I'm wondering how many people here will get it..
  20. RyanSchw

    Antiderivative of arctan and x function (by parts maybe? )

    When your integral becomes - \int \frac{8x^2}{64x^2 +1}dx you should be able to simplify that without using integration by parts again, any ideas?
  21. RyanSchw

    Antiderivative of arctan and x function (by parts maybe? )

    You're right that you need to use integration by parts and you're going about it correctly as far as I can tell. You just need to take the integral of your v*du and add your constant.
  22. RyanSchw

    Trajectory HELP?

    If I were you, I’d start off by drawing a picture. y^2 = 16x isn’t very helpful in this instance, how could you get a better picture of the ground. Once you know what the ground looks like it becomes easier to see where the path of the watermelon intersects the cliff. How would you...
  23. RyanSchw

    Help With Projectiles Problem

    Ok, I’m still learning this stuff too and apparently I don’t know it as well as I thought. Given this problem I would have solved it the same way, and came up with the same answer as technology. The only equation I can find that that relates velocity and time (it’s not in the book that I...
  24. RyanSchw

    Basic algebra question

    I'd be curious to know this as well; if I had to guess I’d say that is has no factors given that the graph never crosses the x-axis. I dunno =(
  25. RyanSchw

    Older Physics Book

    I picked up Physics for Scientist and Engineers With Modern Physics along with a solutions guide for like $20 a few months ago. It's two editions back from the book that's out now and was released in 2000, so far it seems to be really great. It also seems to follow the outline of the video...
  26. RyanSchw

    Sequences HELP

    Yes all the values converge to zero. I really don't like to use the squeeze theorem, whenever I have to use it it's just by trial and error. There should however be another theorem which relates to sequences that jump back and fourth. It's called the Absolute Value Theorem, which would allow...
  27. RyanSchw

    Sequences HELP

    When trying to determine if a sequence converges it needs to approach a certain number. By pluging in numbers for the value of n you'll notice that Cn = [(-1)^n * 1/n!] will jump back and fourth between positive and negative values, and therefore isn't approaching a single value. You...
  28. RyanSchw

    Implicit Diff.

    You have found the slope for any point of that function except where the slope is undefined or wherever the graph may cross itself. To find the slope you would simply plug in your x and y values. However as you said you want to know the horizontal tangents. You can't just simply set the y...
  29. RyanSchw

    Finding Triangle Area using Cross Product

    If you take the magnitude the negative numbers will become positive \sqrt{(-101)^2 + (23)^2 + (-48)^2}= 114.167 ~ /2 = 57.0833
  30. RyanSchw

    Derivatives of ln functions

    You can also find the derivative if you use a u-sub rather than simplifying the natural log. You might notice that the 1 in the numerator is the derivative of the denominator. Try \frac{u'}{u}