Recent content by kezzstar

  1. K

    Graduate Div(gradΦ): Solve 3y12+2y22-3y1y32

    Φ=3y12+2y22-3y1y32 Find: div(gradΦ). I broke it down to find the partial derivative of all 3 coordinates y1,y2 and y3, so using the continuity equation: y1=6y1-3y32 y2=4y2 y3=6y3y1 However, I'm not sure if this correct, would the first part give the gradient? Could someone confirm or solve...
  2. K

    Undergrad How do I convert [D]=[A][ B]T[C] to index notation?

    No I never editted the equation. Do you have any ideas?
  3. K

    Undergrad How do I convert [D]=[A][ B]T[C] to index notation?

    BT? It is the transpose of B.
  4. K

    Undergrad How do I convert [D]=[A][ B]T[C] to index notation?

    I am having trouble converting [D]=[A][ B]T[C] to index notation. I initially thought it would be Dij=AijBkjCkl but I have doubts that this is correct. Would anyone be able to elaborate on this? Regards
  5. K

    Deriving the frequency in a beam equation.

    Where abouts in the text am I looking?
  6. K

    Deriving the frequency in a beam equation.

    Thanks for the reply. Checked that website and still no further forward.
  7. K

    Deriving the frequency in a beam equation.

    supported at each end. m in the equation is the mass of the beam itself. Yeah 3. is wrong, just found that too. Argh I'm stumped...
  8. K

    Deriving the frequency in a beam equation.

    1. Deriving frequency in a beam equation, E=Young's Modulus, I = Moment of Inertia, m=mass, L=length, f=frequency. 2. Deriving this equation: (∏/2)√(EI/mL3) 3.(EI(∂4y/∂x4 = -m(∂2y/∂x2) ≈ EI(∂4y/∂x4+ m(∂2y/∂x2 = 0 Don't know where to go from here...