Recent content by lilphil1989

I could try! If you're reading Feynmann's lectures, I would imagine that you're acquainted with Coulomb's law - a stationary charge generates a static electric field proportional to the magnitude of the charge which drops off with the square of the distance: E \propto \frac{q}{r^2}I think the...

He's saying that the radiation field generated by an oscillating charge drops off less quickly than the inverse square. A stationary charge generates the regular r-2 coulomb field.

Is this true? Imagine a planet that is neither rotating, nor is it's centre of mass accelerating. Then the frame "attached" to the planetary surface WILL be inertial, but the downward gravitational force surely still exists?

In a particle physics formalism, electromagnetism can be described in terms of interchange of virtual photons. The range is then c.t = hbar / E with t the lifetime, and E the energy of the virtual particle. What is the argument then, for long range EM interactions, in terms of E? Is it...

Pressure is a force per unit area. Assuming the force is uniform across the nozzle, then the total upward force should be P x N, where N is the nozzle cross-sectional area. In order to lift something, this force must overcome gravity, ie PN > mg, where m is the mass of the object to be...

I'd recommend David Griffiths' An Introduction to Elementary Particles. This book is aimed at first/second year undergraduates though, so if you're looking for something a little more accessible to the layman I'd suggest Cindy Schwarz's A Tour of the Subatomic Zoo: A Guide to Particle...

response to rl.bhat i think this should be f=(1/2pi)sqrt(k/m) as f*2pi=w and w^2 = k/m