Recent content by calcuseless

welp

Homework Statement Consider an 8mm diameter coaxial cable, which consists of a central conducting wire, and an outer cylindrical conducting braid. If a charge of +30mC is placed on the inner conductor, and a charge of -30mC is placed on the outer conducting braid, what will the electric field...

Ty - Fg = 0 Ty = m * g sin(40°) = m * g sin(40°) = .002kg * 9.8N Tx - FE = 0 Tx = q * E cos(40°) = q * E cos(40°) = q * 2000N/C q = cos(40°) / 2000N/C q = 3.83 * 10-4 Coulombs Is this correct? Should Tx = m * g * cos(40°) instead?

Homework Statement The picture shows a small 2g mass suspended from a massless thread. When a horizontal electric field of 2000 N/C pointing left to right is applied, the mass moves to the position shown and then comes to a stop. Calculate the magnitude of the charge on the mass...

Homework Statement J represents a 3x2 matrix and H represents and 2x4 matrix. y = Hx and z = Jy, where y is a 2x1 matrix, z is a 3x1 matrix, and x is a 4x1 matrix. Form the composition J○H and simplify z = J○Hx. The Attempt at a Solution I don't know what my answer is going to look...

I found the current in the last loop to be .4 A. Using V = IR to solve to get the voltage, I get 4.8 V at the 12-ohm resistor. I then used P = VI to get a power of 9.6 W, but the book has 1.92 W. Did I do anything wrong or is the book wrong again?

Homework Statement Find the voltage V and the power absorbed by the 12-ohm resistor. http://i.imgur.com/xCTEI.png Homework Equations p = vi v = ir KVL KCL The Attempt at a Solution Tried using KVL and KCL in various ways. This book gives horrid examples.

Ah, I didn't understand that concept. Thank you! 2\int_0^{2\pi}\int_0^{R\sqrt{\frac{3}{4}}}\int_\frac{R}{2}^{\sqrt{R^{2}-r^{2}}}r\,dz\,dr\,d\theta Is there supposed to be a 2 out in front? I don't know why I put it there and I don't think it is needed for this problem.

Homework Statement Inside the sphere x2 + y2 + z2 = R2 and between the planes z = \frac{R}{2} and z = R. Show in cylindrical and spherical coordinates. Homework Equations \iiint\limits_Gr\,dz\,dr\,d\theta \iiint\limits_G\rho^{2}sin\,\theta\,d\rho\,d\phi\,d\theta The Attempt at a...