Recent content by duo

the sine function is periodic! what does that say about the 2 pi? 0.2882 is correct.

hi everyone i was wondering if anybody had any suggestions for particularly good places to do a phd in quantum gravity? in the uk or around europe in particular? most theoretical physics positions seem to be focused on high energy theory or strings. i am particularly interested in loop...

Hello everyone. I am currently enrolled in a masters course in theoretical physics, this is great and I am very interested in the subject, so I have no doubts in my mind that I do want to do a PhD. in that area. I am studying in the UK and have been considering applying for positions and such...

hi. well there are two ways i can think of doing it. one is to get the angular velocity of the earth, which shouldn't be too hard since you know it revolves through 2 pi in 365 days. get the radial velocity from that and mutliply it by the Earth's mass to find its momentum. then use the...

I don't really think it is a meaningful question.

Homework Statement A beam of radiation, whose electric vector is in the plane of incidence, is incident at an angle \theta from air onto a transparent material of refractive index, n. Given the relationship between the electric vectors of the reflected (E'') and incident (E) beams derive the...

right, but it's \frac{\sin({\frac{x}{2} + \frac{y}{2}})}{\sin({y/2})} with respect to x. so you use the quotient rule to evaluate it. but the expression on the bottom evaluates to 0 when you differentiate with respect to x? or am i totally wrong? also thank you for responding ;-)

Homework Statement d/dx 1/sin(y/2) The Attempt at a Solution this isn't an entire question, just looking for clarification about something. i have been asked as part of a larger question to find the partial derivative of 1/sin(y) with respect to x. in this case you treat y as a...