Recent content by joelio36

  1. J

    Why does a spinning hemisphere right itself?

    I noticed this intriguing phenomena whilst messing about in work with a perfect glass hemisphere the other day: Place the hemisphere on a surface, with the flat surface facing upwards. (Looks like a 'D' rotated 90 degrees clockwise). When I spin the hemisphere fast enough, it will spin...
  2. J

    Why can't optical phonons travel far?

    I can't figure this out/find the answer. Why are acoustic phonons very low loss (i.e. earthquake P and S waves), but optical phonons die out rapidly? Thanks, Joel
  3. J

    Quantum Computing: Superpositon of states problem

    Still nothing hey...
  4. J

    Quantum Computing: Superpositon of states problem

    Bump. Any chance of an input? I can't find anything online. Cheers.
  5. J

    Quantum Computing: Superpositon of states problem

    Hey, I'm learning about quantum computing for a project and I'm a bit stumped about a concept: They say in quantum computing you can have the superpostion of all possible states, then perform an operation on that wavefunction, and thus have all possible states processed in one operation...
  6. J

    Confused- Integrating a vector field along a curve in 3D.

    Homework Statement Let f be a vector function, f = (xz, 0, 0), and C a contour formed by the boundary of the surface S S : x^2 + y^2 + z^2 = R^2 , x ≥ 0, y ≥ 0, z ≥ 0 , and oriented counterclockwise (as seen from the origin). Evaluate the integral (Closed integral sign) f · dr , directly as...
  7. J

    Finding the Homogenous Solution to a Variable Coefficients 2nd order ODE

    x y'' + (x + 1) y' = 2 x Solve for y(x). Due to the coefficients being a function of x, I have no idea where to start to find the homogenous solution (Complementary Function). I know how to proceed after this part with the variation of parameters method. I just have no idea where to...
  8. J

    Conservation of Energy Problem: Where did it go?

    Conservation of Energy Problem: Where did it go?? Imagine I shoot a boulder vertically into the air with a massive cannon. Its kinetic energy is converted into gravitational potential, and into KE of air particles (air resistance). So at m metres above the ground, mgh is the Potential energy...
  9. J

    What is so beautiful about Euler's Identity?

    I'm a pretty novice Physicist/Mathematician, but I've got a few offers for good universities, to show you my general level of knowledge. Could someone please explain in terms I will understand why this equation is considered so perfect and beautiful?
  10. J

    Which 'Units' will I benefit most from in a Physics Masters?

    Which Subjects will benefit me more: -Mechanics (Extensive, sound foundation in mechanics) or -Further Pure Maths (If I take all the units, likewise, I will have a better understanding of mathematics)
  11. J

    Programs Help a math major choose his classes

    Complex Variables Number Theory Topics in Advanced Calculus Advanced Differential Equations Graph Theory Mathmatical Logic I would choose these as they will provide the most solid mathematical foundations. Number Theory and Graph Theory- If you want to discover anything, a must...
  12. J

    What would the career opportunities be for someone with

    A 1st in Physics, from Oxford or Cambridge?
  13. J

    Am I cut out to take grad/postgrad physics?

    Hello. I'm currently taking my AS/A2 levels (in the UK, its the course before Bsc/Msc). I am finding it ok, and have scored consistently high (80% being an A, with my averages around 90%). Its not the work I'm struggling with, its rememembering old stuff! Its 6 months since I last looked...
  14. J

    Youngs modulus of a cantilever, help please

    Youngs modulus of a cantilever, help please! [1] BACKGROUND: I am doing an experiment determining the young's modulus of a cantilever through principles of SHM (i.e. hypothesis: higher youngs modulus = higher frequency of oscillation. See the attached Pictures for the diagram (strobe is...
  15. J

    The largest angle in a triangle:

    I have a triangle, with sides 8.5, 6.8, and 9.4, what is the largest angle? I think that it will always be the angle opposite the longest side, and used the cosine rule from there, along with trig identies to find the largest possible angle (<180). Is this a correct method?
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