mass and energy Definition and 62 Threads

Can someone explain in detail the relationship between mass and energy? Apparently there's not much of a difference...

does it make sense to say that the reason mass is energy is because they are both vibrations, which are distinguished because they occur on different spatial and temporal scales? and can position-momentum uncertainty be conceptualized as a frequency-amplitude uncertainty?

Homework Statement Here is the problem: http://img413.imageshack.us/img413/748/64my8.th.jpg The Attempt at a Solution I got the effective mass. That's trivial. My question is, what are these graphs actually of? The horizontal and vertical axes are not labeled. Is it an energy...

Hi all, Matter can be turned into energy, correct? If so, what happens to matter's gravity when it's converted to energy? Also how fast is gravity? If the sun was hypothetically removed, would the Earth cease falling towards the sun's former position immediately, or in ~8mins? Thanks

I was working on the following problem: An electron and a positron each have a mass of 9.11 x 10-31 kg. They collide and both vanish, with only electromagnetic radiation appearing after the collision. If each particle is moving at a speed of 0.30c relative to the laboratory before the...

conservation of mass and energy? ok... i get the principle, but what about birth? Meaning what about when someone is born, where is that mass coming from? Where is the energy coming from? The only thing i can think of is the nurishment the mom takes and gives to the baby, but how can that...

well, I'm very new to this, but I'm interested in learning. recently i followed a link from these forums that lead me here http://math.ucr.edu/home/baez/physics/ParticleAndNuclear/photon_mass.html which states: well, I'm a little confused now, because if energy and relativistic mass are...

Hi, I've been wondering about some things; (sorry, introduction is about astronomy, but rest is physics) The future of the universe is determined by the quantity of mass. Lets take the example of the big crunch, in which gravity will essentially get the upperhand. Now, One pointed out...

Ok I have some general questions about mass and energy. I was wondering if photons have any energy themselves? And if they do, why is it that energy can travel at the speed of light but mass can not (ie, if they are interchangeable why can't mass travel at light speed). Thanks for your time.

with relativistic concepts in mind A Kaon split into 2 pions, One pion is stationary and one is stil moving in the same direciton. For Kaon rest mass = 497.67MeV/c^2 Pion = 139.57MeV/c^2 What is the kineric energy of the kaon and what is the energy of hte pion not at rest. Since...

Are there any other examples of converting mass into energy or vice versa besides bringing together a particle and its anti particle? Or is this the only one allowed by conservation laws? By mass I mean the Lorentz-invariant quantity often called 'rest mass'. So the example of a nuclear...

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.