Recent content by joelio36

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...

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

Still nothing hey...

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

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...

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...

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...

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...

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?

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)

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...

A 1st in Physics, from Oxford or Cambridge?

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...

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...

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?