Recent content by epheterson

  1. E

    Securing a 3D Frame: How to Analyze and Solve for Loads?

    It's cool I appreciate your comments. I've never seen this board so mute with such a simple question. Probably a TL;DR situation.
  2. E

    Securing a 3D Frame: How to Analyze and Solve for Loads?

    rcgldr, I don't like you. You don't read. I had already figured out how I was attaching it, and needed magnitudes of the tension in the cables. Both of your posts were useless to me. The correct answer was to simply add the third direction to my moment equation, I'm done now. Mod, please...
  3. E

    Securing a 3D Frame: How to Analyze and Solve for Loads?

    Dude I need numbers, and 4 is not enough.
  4. E

    Securing a 3D Frame: How to Analyze and Solve for Loads?

    No takers? It seems like a simple 3D statics problem, I just haven't had statics in a while.
  5. E

    Securing a 3D Frame: How to Analyze and Solve for Loads?

    Hey all, I'm working on an experiment and we have a frame which will be exposed to loads in all directions. I'm trying to analyze how to best secure it and am having trouble considering the 3D analysis, while the 2D analysis seems rather simple to me. I was informed the 2D analysis is...
  6. E

    MATLAB Can anyone help me solve 2nd-order ODEs using Euler's method in MATLAB?

    So for example, my function is: \frac{d^2y}{dt^2}=-9y So converting it into two first orders would be: \frac{dy}{dt} = z and \frac{dz}{dt} = -9y So as I understand, y' = \int{\frac{dz}{dt}} = -9yt When I plug this into Matlab (with a Euler's ODE solver and initial...
  7. E

    How to Determine Stability in Potential Energy Problems?

    I found out I did it exactly right. When the second derivative is negative, the system is unstable and when it's positive, the system is stable. What's going on is at the top position the spring is pulling on the rod and keeping it in place, so without excess force pushing on the rod, it will...
  8. E

    How to Determine Stability in Potential Energy Problems?

    Homework Statement Includes picture, download question http://docs.google.com/Doc?id=ajccwmhrc3rx_37gs2ht7g9" .Homework Equations The potential energy equation ends up being V = 1/2 k x^2 + W yThe Attempt at a Solution xspring = 2 sin(\Theta) ym = 2 cos(\Theta) V = 1/2*40 (2 * sin(\Theta))^2 +...
  9. E

    What Happens to Torque as the Wrench Lowers?

    I was getting the feeling that I'm lacking information too. Verbatim: Assume that “x” = 6 ft. If Ed stands at “x” and Schueller at “x/2” and they start at a horizontal position, how far (phi in degrees) will they be able to turn the bolts? Ed weighs 250 lb, and Schueller weighs 100 Is...
  10. E

    What Happens to Torque as the Wrench Lowers?

    1. The Funny Intro: The summer before he entered high school, Prof. Schueller’s had to run the farm because his father had an emergency appendectomy. To adjust the “thread” (the width between the wheels) of a John Deere 4020 tractor, a torque of about 1600 ft-lbs. was needed to loosen...
  11. E

    Solving Laplace Transforms: x'' + 2x' + 5x = 3e^{-t}cos(2t)

    A thank you, took a little while to figure that out ... dang algebra
  12. E

    Solving Laplace Transforms: x'' + 2x' + 5x = 3e^{-t}cos(2t)

    I hope somebody's up tonight, this is due in the morning and I'm so close. So I was assigned to solve this differential equation using laplace transforms and although I (think I) can solve it, I'm not getting the same answer that Maple spits out. The DE is: x'' + 2x' + 5x =...
  13. E

    How Do You Expand a Differential Equation Solution into a Taylor Series?

    Well stay with me here... I was unsure and that's what I was asking about, now as I understand it my new equation should be: P(t) = (16543)\Sigma[\frac{(0.095t)^n}{n!}]-16571 True, the P(t) = a t^2 + b t + c is incorrect for the original DE I gave you, but it is correct for a different...
Back
Top