# Search results

1. ### What is the W- boson in beta decay?

neutron => proton + W- => proton + electron + electron anti-neutrino What're the quarks composing W-? To convert a neutron to a proton, there would need to be the expulsion of a down anti-up pair. That would mean a tad bit of mass loss, how does this work?
2. ### Photon's mass?

If mass is energy, then energy is mass. Although the photon has no rest mass, it has energy, thus is liable to gravity. e=mc^2 hv=mc^2 m=hv/c^2, where m would be the relativistic mass? Damn my high school physics teacher for stopping me from learning this sooner! This is blowing my mind.
3. ### This relativistic kinetic energy equation makes no sense to me

This "relativistic kinetic energy" equation makes no sense to me Presently, I'm reading an e-book I found on the internet titled "Relativity: The Special and General Theory", which may or may not have been written by Albert Einstein. Here's the part which has me in deep patatoes: The author...
4. ### How is the density of a white dwarf star calculated?

I have no idea. And how is the pressure/force/intensity of gravitational collapse known?
5. ### Quick question on where to apply time dilation.

While reading one of Starthrower's threads, I became quite confused. If an object moves at close to c relative to the earth, but without acceleration, how do we know that time slows down for it instead of our planet? An inertial reference frame is point that doesn't accelerate, correct? Both...