Recent content by downwithsocks

Sorry it showed up for me. Should work now.

Homework Statement Figure 35-25 shows two sources S1 and S2 that emit radio waves of wavelength λ in all directions. The sources are exactly in phase and are separated by a distance equal to 1.5λ. The vertical broken line is the perpendicular bisector of the distance between the sources. (a) If...

V = IR? Wouldn't I need a value for the resistivity then?

I'm not sure how to tell which section has the greatest voltage drop...looking in my book I can't find an equation that relates voltage and area..

Homework Statement A wire carries a current and consists of three sections with different radii. Rank the sections according to the following quantities, greatest first: (a) current, (b) magnitude of current density, and (c) magnitude of electric field. Homework Equations i =...

Yeah I get the same answer, thank you!

Oh so I do the integral from 0 to 2/3? And then get 2(sqrt(13)/3) because the "curve" is in quadrant 1 and 2?

Times 2 since in the second quadrant 0 <= y <= 1 is still true...so sqrt(13)?

Oh...okay I guess that makes sense, it means like the set of real numbers in two dimensions? So if I just treat the curve as two line segments.. 9x^2 - 4y^2 = 0 18x - 8y(y') = 0 -8y(y') = -18x y' = 9x/4y (y')^2 = 81x^2 / 16y^2 1 + (y')^2 = 1 + 81x^2 / 16y^2 = (16y^2 + 81x^2)/16y^2 = (16y^2 +...

Homework Statement Homework Equations l = int( sqrt( 1 + (dy/dx)^2) dx) from a to b The Attempt at a Solution So far I'm stuck at the R^2 thing. I know if it was just R it would mean the set of all real numbers, but I'm not sure as to what R^2 means and I don't know how to google...

Thanks so much, I was confused because I thought the C values were charges in coulombs, so I didn't know how to use my knowledge of voltage given only charges.

So then the first one won't change, the second one will increase, and the third one will decrease?

Are 6q and 3q capacitances then? I feel really stupid that I just can't work out how to solve this.

Homework Statement The figure shows three circuits, each consisting of a switch and two capacitors, initially charged as indicated (top plate positive). After the switches have been closed, in which circuit (if any) will the charge on the left-hand capacitor (a) increase, (b) decrease, and (c)...

Well, not equal, since mv^2/r isn't 0, but you get the idea...I'm a little tired.