Recent content by quackzilla

  1. Q

    Help with getting an expression for Electric field from a variable Voltage

    It gives V(x,y,x) = A(x^2,-3y^2,z^2) and asks for E. What I have done: E is equal to V/d , and I assume d = (x,y,x) Dividing them I get E= A(x,-3y,z) What am I doing wrong? I also have another question: In every plane parallel to the xz-plane the equipotential...
  2. Q

    Struggling with Definite Integrals: Need Help with Two Challenging Problems?

    yeah, it looked by eye like it should about 1.5, but the equation that I got when I integrated, what I posted above, gave me about 2.5. I'm just not sure how to integrate the square of (log x)...
  3. Q

    Struggling with Definite Integrals: Need Help with Two Challenging Problems?

    Hey, I have a crappy community college professor and apparently I am not smart enough to figure out the parts she didn't teach. the definite inegral of (ln x)^2 - 1 (part of a geometry problem) from e^-1 to e I tried this: [(x ln x - x)^3]/3 - x And got 2.48, but looking at the...