Recent content by kregg34

  1. K

    Courses Does a W on a transcript look bad?

    The second question had multiple parts.
  2. K

    Courses Does a W on a transcript look bad?

    He said he wouldn't test certain things, but he tested them anyways. Also it was only 2 questions, if you didnt get the final answer 100% correct, you got 0 points. And one person got 55%, next highest 30%.
  3. K

    Courses Does a W on a transcript look bad?

    I am currently taking 5 classes, all 3rd year physics. Would it look bad on my transcript if I dropped one? The class average on the midterm was 7% and the prof said that the next midterm would be harder, many people got 0% on it. It is a mandatory class (Electromagnetism). Another prof is...
  4. K

    Math proof: Linear Independence

    Homework Statement How can I show that if a vector (in a vector space V) cannot be written as a linear combination of a linearly independent set of vectors (also in space V) then that vector is linearly independent to the set? Homework Equations To really prove this rigorously it would make...
  5. K

    Equation of magnetic field produced by a solenoid

    Ok I found two equations for the two components, (y is perpendicular to coil, z is parallel) B(in y) =(|μ|/r^3)*(3cos(θ)-1) B(in z) =(3|μ|/r^3)*(sin(θ)cos(θ)) but what is μ and how do I calculate it?
  6. K

    Equation of magnetic field produced by a solenoid

    Homework Statement For a lab we need the equation of the magnetic field strength produced by a solenoid a distance r away from it (outside of it). I tried looking online and couldn't find one that didn't involve a bunch of cross products or similar. Wonder if anyone knows the formula? I know...
  7. K

    Oscillations of a free hanging chain

    Figured it out, thanks man!
  8. K

    Oscillations of a free hanging chain

    u'(x) = cos(√x)/(2√x) s'(ξ) = cos(ξ) (dξ/dx) and ξ = √x so dξ/dx = d√x/dx = 1/(2√x) aren't they the same? or should I write s'(ξ) = cos(ξ) (dξ/dξ) = cos(ξ) with respect to ξ instead of x?
  9. K

    Oscillations of a free hanging chain

    Not sure I understand. Cause I thought the transformations of u(x) were basically saying u(x) = s(√x). So I took the derivative of both sides with respect to x and substituted u'(x) and u''(x) in
  10. K

    Oscillations of a free hanging chain

    oh sorry, that's how I derived it but I wrote it wrong. x is measured from the free end of the chain upwards
  11. K

    Oscillations of a free hanging chain

    On the question it actually gives you that equation, you have to derive it, and that's what it is
  12. K

    Oscillations of a free hanging chain

    Homework Statement I am trying to find an equation for a free hanging chain of mass m and length L. The chain is hanging vertically downwards where x is measured vertically upwards from the free end of the chain and y is measured horizontally. Homework Equations [/B] I derived this...
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