Special and General Relativity Question for Physicts or Physics Teachers?

Question

If a photon has a mass of 0, then how could matter (a so dense form of energy, Energy=Rest Mass X Celeritas Squared) have mass? And if its mass is about zero and not zero, then how does it travel in celeritas? And why don't I feel I carry heavy things in day although photons move in celeritas (have infinity as mass)? Give scietific clues and examples please.

Now, about the General Relativity. Why does mass cause curve in space-time contiuum while there is not gravity to pull it down? Is it that its high content of energy pushes space-time contiuum with enough force to force it to curve?

Answer 1

Read this link:-

http://math.ucr.edu/home/baez/physics/ParticleAndNuclear/photonMass.html

Answer 2

1st. Stop thinking of a photon as a particle similar to a stone. A photon is simply a unit of energy.

Secondly, Mass and Weight are not the same thing. When this reasoning is applied to a photon, it is a bit complex but let me use an example. If you are under water, you do not feel the weight of the water because it is acting from ALL directions. Similarly, if the energy is at rest, you would not feel anything unusual. However, when you are accelerating, the energy is imbalanced and that is why you feel an acceleration.

About the second question. Think of a spinning disc. At a very small scale, each part is moving in a straight line. On a large scale, each part is moving in a circle. Again, it is all a matter of perception rather than actual deformation in space.

Answer 3

A photon has zero REST mass. Protons etc. do have rest mass. We don't know why mass experiences gravitational attraction or warps spacetime. For the rest, you need to study the subject.

Answer 4

photons have zero rest mass, since photons travel @ c, they do have mass. general relativity states that mass tells space-time how to curve, and space-time tells mass how to move.

Answer 5

You seem to have some big misconceptions about special and especially general relativity. I suggest you read the wikipedia articles on both topics, and if you're still confused, come back and ask again. There isn't a short easy response to what you don't understand.

Answer 6

For particular relativity you elect in basic terms trouble-free algebra and calculus. For common Relativity, you elect tensor calculus and Riemann geometry. in spite of the undeniable fact that, for finished understanding of the inspiration for those, you ought to comprehend Maxwell's equations which require vector calculus and partial differential equations. For quantum mechanics you elect matrix algebra and all the above.

Answer 7

For your first question there is a detailed explanation here:

http://math.ucr.edu/home/baez/physics/ParticleAndNuclear/photonMass.html

Answer 8

Oh my god... I can't even make head nor tail from your question...