Recent content by pleasehelp12

oh, ok thanks i didn't even think about switching to polor coordinates.

ohhh... ok thanks. I should have seen that.

Homework Statement Make the appropriate change of variables and evaluate \int\int _R\(sin(9x^2+4y^2)}\;dA Homework Equations R is bounded by the ellipse 9x^2+4y^2=1 The Attempt at a Solution I can't figure out what the substitution should be I tried u=9x^2 and v=4y^2 and that...

Homework Statement \int\int\int _E\(x^2y}\;dV Where E is the solid bounded by x^2/a^2+y^2/b^2+z^2/c^2=1 Homework Equations variable substitution x=au, y=bv, z=cw. The Attempt at a Solution I found the jacobian (abc) and I substituted my variables but I can't find the limits of...

gravity inside a solid sphere Homework Statement I'm having a hard time setting up a triple integral to find the force of gravity inside a solid sphere. I've done a similar proof in physics before with gravity inside a spherical shell, but it only required a single integral. In this problem...