Recent content by ELEN_guy

  1. E

    Please help Need solution to Second Order nonlinear DE

    Once again, thanks a lot for taking the time to help! I totally forgot about Maple..I'm going to see if anyone on my team knows it well. At this point I'm about ready to take that expression and make up some constants to fit the data.
  2. E

    Please help Need solution to Second Order nonlinear DE

    yes, it represents the equation of motion of an inertial system with a drag force and an external force which is NOT time-related. Namely, its an idealized model of the Apollo reentry. The differentiation variable is, in fact, time dependent while the F(x) + C term is not...I just wrote the...
  3. E

    Please help Need solution to Second Order nonlinear DE

    Thanks! not sure how to use power series to solve DE's...never covered that topic when I took my diff eq course. don't know how to imbed those formulas either..
  4. E

    Please help Need solution to Second Order nonlinear DE

    The differentiation variable is NOT t, its just some other variable..lets say x: y = y(x), y' = dy/dx..and so on yeah that makes sense.. F(t) + C = K A, B, and C are constants which are not zero, one, or equal to each other.
  5. E

    Undergrad What is the integral of (dy/dt)^2 ?

    What is the integral of (dy/dt)^2 ?? As the title reads, I was hoping someone knew what the integral with respect to time of [dy/dt]^2 was. To clarify, I am looking for: the integral with respect to time of the (time derivative of y)^squared sorry, can't figure out how to get it to display...
  6. E

    Please help Need solution to Second Order nonlinear DE

    Does anyone know how to solve the following Non-linear, second order, differential equation? A*y" + B*(y')^2 = F(t) + C where A, B, & C are constants **please note, in case the above notation isn't clear, the y' term is squared which is what makes it non-linear. Also, F(t) is time...
  7. E

    Obtaining a given resistance through series and parallel combinations

    I actually tried writing a C++ program to do this but having only taken one intro level course it was too big an undertaking to be worth the effort. So I just have to randomly fiddle with the numbers? Is this how its really done in the industry?
  8. E

    Obtaining a given resistance through series and parallel combinations

    Hi, just joined this forum, I am an EE undergrad and trying to find a solution to the following assignment, hope somebody here could help or point me in the right direction. Given some resistor values (1.8ohm, 20ohm, 300ohm, 24kohm, 56kohm) I must construct series and parallel combinations...