Jan 27, 2022 · The mass of an object is a fundamental property of the object; a numerical measure of its inertia; a fundamental measure of the amount of matter in the object. Definitions of mass often seem …

May 23, 2021 · I am aware that energy mass are inter-convertible using the famous $$E=mc^2$$ But why is it that energy and mass are basically the same thing that takes different forms?

Nov 1, 2012 · The mass, strictly the inertial mass, relates the acceleration of a body to the applied force via Newton's law: $$ F = ma $$ So if you apply a force of 1 Newton to a mass of 1kg it will accelerate …

You can get a mass metric from the energy of a photon, everything else is a matter of definition of the English words. It is a universal statement to say that photons do not have rest mass.

Dec 17, 2021 · The addition of the four vectors of two non collinear photons has an invariant mass even if each individual photon has zero mass, thus the built up light will have an invariant mass, within the …

The conversion between mass and energy isn't even really a conversion. It's more that mass (or "mass energy") is a name for some amount of an object's energy. But the same energy that you call the …

In general relativity, gravity affects anything with energy. While light doesn't have rest-mass, it still has energy --- and is thus affected by gravity. If you think of gravity as a distortion in space-time (a la …

Now that "mass" isn't being used to describe the total thing-that-is-related-to-inertia of a moving object, we can just use that word to describe the "intrinsic mass" or "rest mass" without any confusion.

Feb 6, 2011 · The mass of colored objects is a subtle thing - it depends on the RG scale and the masslessness is only relevant at very short distances, much shorter than the proton radius (QCD …

Apr 30, 2015 · We almost always determine mass by measuring weight. Weight is the force on an object exterted by a gravitational field, and is proportional to the mass. On the Earth's surface W = m*g. We …