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What subatomic particles have a mass of 0?
The photon. This refers to the "rest mass"; since the photon has energy, it also has an associated mass. But the "rest mass" or "invariant mass" is zero.
The difference between mass and rest mass?
"Mass" is often understood to mean "rest mass", at least in more advanced treatments of the topic. This is because it is the invariant mass - the "rest mass" is the same for all observers. However, "mass" might also refer to the relativistic mass - the mass, increased due to a high speed.
WHAT According Einstein is the relativistic mass of light?
Any object has two masses associated.What is sometimes called the rest mass, or invariant mass, for the photon (piece of light), is zero. Its relativistic mass is equal to its energy divided by c squared.
What percentage of the speed of light is required to double the moving object's mass?
Seems simple but it is a bit more complicated than that. The Relativistic Mass is only energy, not Mass. The "Invariant Mass", also known as Rest Mass, does not change. See: http://math.ucr.edu/home/baez/physics/Relativity/SR/mass.html
Can a nucleus emit alpha particles that have different energies Explain?
Any particular decay process is associated with a change from one energy state to another, so its emitted particles will have a specific energy. Charts of the nuclides will give this energy for any particular decay event. See also the extract from Wikipedia article on 'Radioactivity', below. You can view the whole article on the link attached.'Radioactive decay results in a reduction of summed rest mass, which is converted to energy (the disintegration energy) according to the formula E = mc2. This energy is released as kinetic energy of the emitted particles. The energy remains associated with a measure of mass of the decay system invariant mass, inasmuch the kinetic energy of emitted particles contributes also to the total invariant mass of systems. Thus, the sum of rest masses of particles is not conserved in decay, but the system mass or system invariant mass (as also system total energy) is conserved.'
What is a Zeuthen-Segre invariant?
A Zeuthen-Segre invariant is an invariant of complex projective surfaces.
A chair has a mass 10 kilograms on Earth. What is the mass of the chair on Mercury?
A body's mass is invariant regardless of its position in space. Therefore, the chair's mass on Mercury will be identical to the chair's mass on Earth, that is 10 kilograms.
How can particles be without mass?
All particles that move slower than the speed of light have a "rest mass" or "invariant mass" - and that means, almost all particles. One of the few particles that does NOT have a rest mass is the photon, since it moves at the speed of light. It does have energy, and therefore (by mass-energy equivalence) it also has mass, but this is not "rest mass" and is often not counted as mass.
Do photons physically move or displace opsin molecules of rhodopsin and if so how do they do so since photons have nearly 0 mass do they use their mass or some type of energy transfer?
Photons have energy, therefore they have both mass, and momentum. (Note: They do have a "rest mass" or "invariant mass" of zero, which basically means that they can only move at the speed of light.) Photons of high energy (and high mass, and high momentum) can destroy molecules, or even atoms.
What is the mass of 25kg on the moon?
the mass is an invariant: so 25kg mass would still be 25kg mass where ever it was. the force a 25kg mass exerts would change, as the force is a variant that would be altered by the lower gravitational strength of the moon.
If light get suck in the black hole it still can escape the gravity because it has no mass but why light still in the black hole?
Light does have mass - since it has energy, it follows that it also has mass. Its REST MASS or INVARIANT MASS, however, is zero. On the other hand, the black hole distorts space and time in its surroundings so much that the only paths a ray of light (or anything moving at the speed of light or less) can take, will take it deeper into the black hole.
How does a black hole attract photons if they have no weight?
It is not the weight that is relevant, but the mass. And when it is stated that a photon has no mass, that refers to its "rest mass" or "invariant mass". But since it has energy, it certainly has an equivalent mass as well - all energy has mass. In any case, what actually happens here is that the black hole distorts space and time around it in such a way that light will no longer go in a straight line (in the traditional sense); once it gets within the event horizon, a photon can only get deeper into the black hole, no matter in what direction it moves.
