Recent content by sm1t

Basically I am trying to recreate this http://mathforum.org/advanced/robertd/magneticpendulum.html now my differential equation is NDSolve[{x''[t] + Rx'[t] - Sum from i=1to3 of (x-x[t])/(rootof(x-x[t])^2 +[y-y[t])^2 +d^2)^3 + Qx[t]==0, {y''[t] + Ry'[t] - Sum from i=1to3 of...

I am using the formula for curl in spherical, I konw I said cylindrical. Taking the first cross product, zhat(\nabla x r^2 rhat) I use the ffact its in the rhat direction, so in the curl formula, sub r^2 for all r direction components. However they are then partially differentiated and I get...

Homework Statement \nabla of (r^-2)rhat x zhat Homework Equations \nabla(AxB) = B(\nablaxA) - A(\nablaxB) Using cylindrical coordinates and curl in cylindrical with the above equation, I get zero? But I think I am wrong? Any help?

I guess something like, "this statement is false", which is a sort of paradox, so because it can be neither true nor false, they release him.

Homework Statement An ideal diatomic gas, in a cylinder with a moveable piston undergoes the rectangular cyclic process shown below. Assume that the temperature is always such that the translational and rotational degrees of freedom are active but the vibrational modes are "frozen out". Also...

Hi, Been registered for a while here, but this is my first post, been using the forum as more of a resource before. I am going through some past papers, but I am faltering at 1 question. Homework Statement A particle moving along the x-axis with velocity v experiences a resistive force...