Recent content by BeBattey

So I'm a senior at a lesser known university, I 'believe' I did very well on my PGRE though I don't have my scores yet, and I've maintained a 3.7 average in my physics courses. The only thing holding me back from admission into a fantastic grad program is my complete lack of research experience...

Also I'm not quite sure which forum to put this in. It's a fourth year undergrad course, but all I've been told about the professor is that he gives us grad school type problems like this one, as previous graduates have come back and told us that their graduate EM course was actually easier.

Homework Statement A conducting spherical shell is divided into upper and lower halves with a narrow insulating ring between them. The top half is at 10V and the bottom half is at -10V. Write down the appropriate expansion for Φ and use symmetry and the expected behavior at the origin to...

Thanks for the response! So the surface charge density you're talking about, is that the bound charge mentioned in the textbook? I know the bound surface charge is P dot n-hat, given the polarization of a dielectric, is this what you mean about the proportionality?

Ok what?

Please show you've attempted the problem and use the template provided by the forum for homework questions.

Could you show me ho you got the time for t2? Also, double check your dimension on that equation.

Because L/t is v. Average velocity over a distance is always going to be the length traveled over the time it took.

Yes, it sure is. But part b has tone tackled a different way, setting the distances equal instead. I'm sleeping now, but ill be back in the morning hopefully :)

Yes, but only for the part of the problem where the car spends equal time at each velocity.

If you're working with the same time for both, yes! But if both legs have the same amount of time spent at them, you can just use the average velocity equation you had earlier. If they go the same distance, they must have differing times, so you'll be a t_1 and t_2, but then can set them equal...

I've just finished my first term in an undergrad electromagnetism course using Wangsness as a textbook and we ended on the displacement field. I feel like Wangsness doesn't give a very good explanation of what the whole point of it actually is, and I still don't quite understand how to use it...

The average between two velocities is weighted by the time the car speds at that velocity, not the distance traveled at that velocity. So if the distance for both velocities is the same, half the total distance for each, then the car must spend less time going fast then slow, because it would...

I didn't analyze your work equation by equation but the method did seem correct. And yep, your method to find the angular velocity is correct :)

Try drawing the system at an angle, so that the surface of the ramp is flat, horizontal. Then apply your force diagram, with x being left/right and y being up/down. Just don't forget that the force of gravity is now down at an angle to the y axis, equal to the angle of inclination of the ramp...