Relativistic Mass
Proverbs 11:1 - The Lord abhors dishonest scales, but accurate weights are his delight.
For the definition of relativistic mass see Inertial Mass, which is identically the same thing.
Textual Examples
Relativity: Special, General and Cosmological, Rindler, Oxford Univ., Press, (2001), page 120
According to Einstein, a photon with frequency n has energy hn /c2, and thus (as he only came to realize several years later) a finite mass and a finite momentum hn/c.
From Introducing Einstein's Relativity, Ray
D'Inverno, Oxford Univ. Press, (1992), page 50
Finally, using the energy-mass relationship E = m
c2,,
we find that the
relativistic mass of a photon is non-zero and given by
m = p/c.
Combining these results with Planck's hypothesis,
we obtain the following formulae for the energy E, relativistic mass m, and linear
momentum p of the photons:
E = hf m = hf/c2 p = hf/c
Special Relativity, A. P. French, MIT
Press, page 20
Let us now try to put together some of the results we have discussed. For photons we have
E = cp
and
m = E/c2
(the first experimental, the second based on
Einstein's box). Combining these, we have
m = p/c
Journal Examples Apparatus to measure relativistic mass increase, John W.
Luetzelschwab, Am. J. Phys. 71(9), 878, Sept. (2003). Relativistic
mass increase at slow speeds, Gerald Gabrielse, Am. J. Phys. 63(6),
568 (1995). In defense of relativistic mass, T. R. Sandin, Am. J. Phys. 59(11)
1032 (1991). A simple relativistic paradox about electrostatic energy, Wolfgang
Rindler and Jack Denur, Am. J. Phys. 56(9), Sept. (1988). An elementary development of mass-energy equivalence, Daniel J. Steck,
Frank Rioux, Am. J. Phys. 51(5), May (1983). Observed Relativistic Mass Increase for 0.3 eV Electron, G. Gabrielse
and H. Dehmelt, Bull., Am. Phys. Soc. 25, 1149 (1980). Mass & Energy - by Q. ter
Spill, Institute of Physics Education Specific Instances - Not Used Throughout Text Gravitation, Misner, Thorne and Wheeler, W.H. Freeman & Co.,
(1973), page 141. Proof that stress-energy tensor is symmetric Calculate in a specific Lorentz frame. Consider first the momentum density (components
Tj0) and the energy flux (components T 0j). They must be equal
because energy = mass ("E = Mc2 = M") T j0 = (energy flux) = (energy density) x (mean velocity of energy
flow )j = (mass density) x (mean velocity of mass flow )j = (momentum density) = T 0j Cosmological
Principles, Peacock, Cambridge Univ. Press, (1999). From page 18 When dealing with mechanics, however, we have not one conserved quantity, but four:
energy and vector momentum. So, although Jm is a
perfectly good 4-vector mathematically it is not physically relevant for describing
conservation laws involving mass. For example, conservation laws involving Jm predict that density will change under Lorentz
transformations as r --> gr, whereas the correct law is
clearly g2 (one power of for change in number
density, one for relativistic mass increase. From page 17-18 The only ingredient now missing from a classical theory of relativistic
gravitation is
a field equation: the presence of mass A First Course in General Relativity, Schutz, Cambridge Univ. Press,
(1990). Page 94 One final note: it is clear that (4.6) N*N = n2, n = (-N*N)-1/2 Thus, n, is a scalar. In the same way that 'rest mass'
(a.k.a. proper mass) is a scalar, even
though energy and 'inertial mass' are frame dependant, here we have that n is a
scalar, the 'rest density,' even though number density is frame dependant. A Short Course in General Relativity, Foster & Nightingale, Springer
Verlag, (1994). Discussing light climbing out of a gravitational field Then in traveling from the emitter to the receiver
a photon suffers a loss in
"intrinsic" energy equal to its gain in gravitational potential energy. The loss
in intrinsic energy is h(nE - nR), while the gain in gravitational potential
energy is on assigning the mass hnE
/c 2 to the photon. Equating these leads to the fractional-shift formula
(4.17). This formula assumes that the photon's energy has both inertial mass and
gravitational mass, and depends in an essential way on the equivalence principle. The Evolution of Physics, Einstein & Infeld, Touchstone Pub.,
(1966). Commenting on the observation made by an observer inside an accelerating elevator
that light is weightless Einstein But there is, fortunately, a grave fault in the reasoning of the inside observer, which
saves our previous conclusion. He said: A beam of light is weightless and,
therefore, it will not be affected by the gravitational field. This cannot be right!
A beam of light carries energy and energy has mass. University Lecture Notes - Online Examples From Second
INTERNATIONAL GIREP Seminar on Quality Development in Teacher Education and
Training, 1 - 6 September 2003 University of Udine, Italy. -- Ambiguities in
Teaching Physics: The case of weight and Energy-Mass We think that, all three opinions are equivalent with one another, except in the cases
where their supporters pretend to prove the priority of one opinion upon another, or, in
the worst cases, to proclaim other opinion/s as wrong, even when these opinions are
formulated or stated by Einstein, Heisenberg, Feynmann or Hawking. Syracuse University: Special Relativity - Lecture
16 , Lecture
17 The
Special Theory of Relativity - J D Cresser, Department of
Physics, Macquarie University Washington State
University - Einstein and Relativity Michael
Fowler - University of Virginia Keith E. Holbert -
Relativity notes - Arizona State University Relativity
- University of Chicago Relativistic
mass and dynamics - Royal Holloway, University of London Special
Theory of Relativity - Florida State University Physics 110
- Astronomy Dept. U. Washington - &quoot;But the most honest answer to your question is
yes--light has mass." Particle Accelerator Labs The real limiting factor is the basic design all particles must orbit at the
same frequency, whatever their speed. As particles approach the speed of light, however,
they behave as if their mass is increasing. Accelerating them becomes more difficult and
they start to lag behind the oscillating electric field. As cyclotrons approached 20 MeV
they began to reach their limits and a new design had to be produced. Lawrence Berkeley
National Laboratory University
of Wisconsin-Madison Other Dr. Greg Snow -
University of Nebraska Physics Today -
Concepts of Mass in Contemporary Physics and Philosophy - Mass Jammer Statistical
Physics - Kip Thorne - Inertial mass per unit volume What is mass? - by R. I. Khrapko,
Physics - Uspekhi, 43 (12), 1267 (2000)
must determine the gravitational field. [...] Now, if this equation is to be covariant, Tmn must be a tensor and is known as the
energy-momentum tensor (or sometimes as the stress-energy tensor). The meanings of its
components in words are T00 = c2x(mass density) = energy density, T12
= x-component of current of y-momentum etc. From these definitions the tensor is readily
seen to be symmetric. Both momentum density and energy flux density are the product of a
mass density and a net velocity, so T0m = Tm0.