Recent content by JohnGano

  1. J

    Undergrad Molten iron can not be magnetized

    A ferromagnetic material may be paramagnetic above the Curie temperature, but it will still align with the application of a strong enough external magnetic field. Right? This thread brought this question to my mind...
  2. J

    Computer Science + Physics: Advice for Double Major

    Hi everyone, I'm thinking about doing a computer science/physics double major. I'm interested in computational physics, so I think it'd be a good match. So I guess I have two questions... 1. If I wanted to do computational physics, would a computer science/math double major be a good...
  3. J

    Graduate What Happens to Time Dilation at a Black Hole's Event Horizon?

    I'm looking at this equation for gravitational time dilation: T = \frac{T_0}{\sqrt{1 - (2GM / rc^2)}} I understand the relation of time dilation and velocity, and how v must be less than c, but I don't understand what exactly is implied here. At a certain point, M could be great...
  4. J

    Undergrad Understanding Resistivity and Current Relationships: Explained Simply"

    So, resistivity goes like \rho = R \frac{A}{l} (where A = cross sectional area, l = length) I solved for resistance and got R = \rho \frac{l}{A} If R = \rho \frac{l}{A} = \frac{V}{I} would the current correspond to the ampacity of the material? Or, if you were to replace R in the first...