Recent content by Inna

1. Physics Physics a worthless degree?

5. MathWorks, technical writer, \$60K/yr - turned it down What did this job entail that they were willing to pay that much?
2. Physics Physics a worthless degree?

I think a better way to sum up the discussion would be this: Physics degree does not provide direct training for any career, except academic. If you are not interested in that, you must be prepared to study/train more on top of your degree.
3. Physics Physics a worthless degree?

The concept of Physics serving as a filter reminds me of a joke that circulated in my grad school: A graduate TA is teaching Physics to a bunch of pre-med students. In the middle, a student raises his hand: "And why do we need to know all this?" Without missing a beat, the TA replies...
4. List of Interactive Programs/Software/Applets

Great thread - thanks! Another website with a lot of interactives (Virtual Physics Laboratory): http://www.phy.ntnu.edu.tw/ntnujava
5. Magnetic field within cylinder using Ampere's Law

Try a rectangle with one side placed inside the cylinder, parallel to the z-axis, and the opposite side outside of the cylinder.
6. Magnetic field within cylinder using Ampere's Law

Wait - it seems like you are using a Gauss law instead of Ampere's law. You need a circulation of B-field around the boundary of your surface. It will be proportional to the current going through the surface.
7. Magnetic field within cylinder using Ampere's Law

Did you try using the same reasoning? That is, finding a surface that would allow to calculate the circulation of z - component of the field?
8. Math Introductory vs Upper-Level Math Coures

What angers me the most is it waters down the value of the degree. In fact, looking at the courses, I think you can graduate with a BS in Mathematics from my school and not do a single proof if you plan correctly; things like Topology, Algebra and Analysis can be avoided, and you'll still have...
9. Not-So-Parallel Plate Capacitor

2. Homework Equations : Already listed one, and E=V/d, and the rest I don't know. What do you mean by "d" ? The distance between the plates varies with x.
10. Magnetic force between two parallel hanging wires

Tx = Tsin(6), Ty = Tcos(6) I am not sure if your expression for the distance between the wires is correct if theta is 6 degrees. Would not it be r = 2*(.04)*sin(6)?
11. Magnetic force between two parallel hanging wires

Can you try to write these equations?
12. Magnetic force between two parallel hanging wires

Free body diagram for one of the wires is a great idea. You are right that veritical component of tension should be equal to the force of gravity and horizontal component is equal to magnetic force between the wires. This gives you two equations with two unknowns. Good luck!
13. Magnetic force between two parallel hanging wires

What do you have to find?