Recent content by jwj11

Hmm.. I guess I am inputting it wrong. This is part of a webwork assignment (an online submission assignment)

Homework Statement Solve the separable differential equation for u du/dt = e^(6u + 8t) Use the following initial condition: u(0) = 13. Homework Equations Techniques for solving separable differential equations. 1. Group variable and respective dy,dx,dz, etc. together 2. Integrate both...

because when I did it both of the materials were attracted to the charged comb? How am I suppose to differentiate which is more electronegative?

Homework Statement This is just a thought experiment and I wanted to know if my answer is correct. If I... 1) Tie a string to one of the plastic combs and suspend this comb from the edge of a table 2) Then rub the suspended plastic comb in wool to give it a negative charge 3) and If I...

Ahh fudge. Keep getting proper and relativistic concepts mixed up in my head. Thanks for the correction Doc Al.

Can someone please correct me if I'm wrong but I think that kev's answer is incorrect. L is the relativistic distance measured by an observer in the moving space ship, which is something we want to find for question A) L0 the proper distance, is measured by an observer at rest in the same...

Hey Defennder, Thanks for sticking with me on this difficult concept. I hope you had a great Christmas. So to summarize this: http://img407.imageshack.us/img407/5656/dsc02768iz3.jpg First of all when the switch is turned on the bottom of the solenoid is N, while the top is S...

Wait, so for both A) and C): The copper ring will move away from the solenoid? This is because the copper ring has an induced current that produces a magnetic field that opposes the field created from the solenoid? Am I correct though that the copper ring will have current that goes to the...

I still don't really understand all of this induced current business but here's an educated guess. a) The copper ring will move towards the solenoid. This is because the solenoid generates a magnetic field where the solenoid's top is S, and the bottom is N. Due to this magnetic field an induced...

Copper won't move so why does the diagram hint that it is free to move? What will happen to copper is that it will have a current in it for a) and c) as a counter induced magnetic field, whereas for b) nothing will happen

Ok so copper is not a ferromagnetic material so it shouldn't be affected by the magnetic current generated by the solenoid? a) When the switch is closed a current can be seen in the solenoid (curl) part of the circuit. This generates a magnetic field but the copper will not move because it is...

Homework Statement http://img407.imageshack.us/img407/5656/dsc02768iz3.jpg Examine the circuit shown in figure 12. When the switch is closed, assume the magnetic field produced by the solenoid is very strong. a) Explain what will happen to the copper ring (which is free to move) when...

Homework Statement Which two of the three types of fields in the title of this are thread are the most similar? Provide supporting evidence? Homework Equations Gravitational: -Source: point mass -Field intensity proportional to: M/r^2 -Range: long range -Strength: weak -Direction of field...

I don't think the OP's answer is correct. Defennder do you mind sharing how you got that number? Here's what I got GIVEN: q1 = +1.0*10^-6 C q2 = 3.2*10^-3 C r1 = 1.0*10^2 m r2 = 0.40 m E1 = (k*q1*q2) / r1 = (9.0*10^9*3.2*10^-3*1*10^-6)/(100m) = 0.288 J E2 = (k*q1*q2) / r2 =...

So I get that [25 degrees North of East] is a line that is 25 degrees above the east axis. But what about [E25S] Is that [25 degrees South of East] or [25 degrees East of South] My teacher says that [E25S] is [25 degrees East of South] but based on that notation I think it is [25...