Recent content by ehrenfest

Its a problem I thought up myself. The magnetic field extends out to infinity in two directions (say x and y) and it points in the third direction (z).

Homework Statement The magnitude of an infinite slab of uniform magnetic field is increased. What is the electric field induced by Faraday's Law Homework Equations \nabla \times \mathbf{E} = -\frac{\partial \mathbf{B}}{\partial t} The Attempt at a Solution Choose any point inside...

Marion and Thornton derive that principle for any system of particles that obeys the weak form of Newton's third law (that forces are equal and opposite). Is the weak form of Newton's third law violated here?

Homework Statement A long, straight, and massless rod pivots about one end in a vertical plane. In configuration I, two small identical masses are attached to the free end; in configuration II, one mass is moved to the center of the rod. What is the ratio of the frequency of small oscillations...

That was a hypothetical situation. Such a person may not exist.

What is the difference between physics and chemistry? How would you explain it to someone who has studied graduate level physics and chemistry but has never heard of the terms "physics" or "chemistry"?

I'd prefer the US. Quantum probably.

I have the same question.

Let's say someone gets my credit card number and uses it to make expensive purchases. If I can prove that I did not make these purchases, do I still have to pay the charges? I think I don't, but then does the credit card company have to pay the business at which the purchases where made? If the...

Which of the following means of communications is it safe to transmit sensitive data such as a credit card number or a social security number through: 1) cell phone 2) landline phone 3) fax 4) snail mail ? I have been trying to use google to get an answer to this question, but that did...

Interesting. Have you also considered the amount of energy that goes into producing/ recycling computers? That is, have you considered the entire computer life cycle? All of the hardware inside a computer is very very artificial so I imagine it takes a lot of energy to produce. Sure that is only...

I mean if everyone in the world wanted to use a computer as much as e.g. Americans do. Can we supply enough energy for that? Can we supply enough energy for that while not destroying the environment or the planet? My worry is that it seems unfair for Americans to use computers as much as we do...

How sustainable is computing? I spend several hours working on a computer each day and I am worried that this practice is not sustainable and/or not scalable to the entire world population. What do you guys think?

Whenever I write in cursive I have kind of a bias to not use words that contain an i or a t or a j because I have to go back and complete those letters. :) When I do use words that have a t, I have a tendency to just draw a line over the entire word, crossing my ls as well as my ts. When I do...

Do you think writing in cursive is going out of style? I heard someone say today that they might stop teaching it because everyone seemed to be writing in the standard, non-cursive way or just using a computer and not really writing by hand at all very much. There are some disadvantages to...