Recent content by MatSci

Do you have a textbook?

Nice links Tom, thanks.

Anyone can answer this? Or maybe send some sites on how earthquakes form tsunamis?

I was reading in the newspaper and saw that it said that there was first an initial tidal wave, then the water receded for 10 minutes, then the big wave came crashing ashore. I was just trying to think on why the water would recede for so long, being 10 minutes. When the earthquake takes place...

Thanks it does help.

Can anyone direct me to some good sites describing how to construct phasor diagrams based on different circuits? Didn't have much luck using search engines.

Well actually we reduced biot-savart for an infinitely long wire. We don't want to do this in this problem. So before integrating from 0 to infinite, you want to integrate from -L/2 to L/2 where L is the length of each square side. This comes out to be (mui/2(pie)r) (L/(L^2 + 4R^2)^(1/2))...

ah ok, and my ellipse is the constraint then?

I'm just not sure what the "which the XY product is a minimum" is really asking me.

You can derive a simpler formula from biot-savart by seeing that in a long straight wire, r = square root of l squared + R squared where l is the lenth of the wire and R is the distance from the wire. Also sin of the angle is R/r. subsituting these in and integrating with respect to s...

Hello, the problem that i can't figure out says: To Use LaGrange multipliers to find all points on the ellipse 8x^2 + 2y^2 = 16 at which the product xy is a minimum? Any hints appreciated.