# Special relativity (mass-energy) Calculator

## Calculates the mass-energy of a body moving with some relative velocity with respect to the observer.

 Rest mass m0 kg Relative velocity v km/s≦c 6digit10digit14digit18digit22digit26digit30digit34digit38digit42digit46digit50digit Rest mass energy E0 MJ Relativistic mass energy E MJ Mass energy rate E/E0 Velocity ratio to light v/c %
Special relativity (mass-energy)
 [1-10] /14 Disp-Num5103050100200
[1]  2019/12/09 16:52   30 years old level / An office worker / A public employee / Useful /
Purpose of use
Determining the speed of the 1991 "Oh My God" particle event based on an assumption of it being a slightly less fast iron nucleus, and then applying that speed to a 4mg micrometeor (diameter of ~ 0.5mm) and calculating if the energy would be less or more than the energy of the Chicxulub impact event. 2,200,729,956,560,423,000 MJ seems to be roughly equivalent to 4 dinosaur-killing asteroid impacts at the same time.
[2]  2019/06/11 10:54   20 years old level / High-school/ University/ Grad student / Very /
Purpose of use
understanding why exceeding the speed of light would violate half of the known physics
[3]  2019/05/02 10:28   30 years old level / An office worker / A public employee / Very /
Purpose of use
What would be the surface gravity of a DVD of the film 'Gravity' starting Sandra Bullock if it was accelerated to 99.99999999999702% the speed of light? The answer is a rather poultry 0.0000043g. This low number probably reflects the poor quality of the film.
[4]  2019/01/23 21:26   40 years old level / Others / Very /
Purpose of use
To calculate the energy of an 866.67 fm³ mass of neutron degenerate matter at neutron star core density travelling at 99.9999% c.
[5]  2018/08/06 02:52   Under 20 years old / High-school/ University/ Grad student / Very /
Purpose of use
Determining yield of a liquid mercury-based RKV
Comment/Request
This is incredible.
[6]  2018/02/04 23:51   20 years old level / An office worker / A public employee / Very /
Purpose of use
Sci-fi writing.
Comment/Request
Holy, this calculator is amazing. Thanks.
[7]  2018/01/31 08:34   60 years old level or over / A retired people / Very /
Purpose of use
Had a silly little idea I rattling around in my head for years. Thought I could prove it wrong and put it to bed. Turns out it''s valid to more than 16 decimal points. Now I have to kind a competent physicist and ask him how WTF??? Thanks so much, if I had found this site earlier I would be finished now. ;-)
[8]  2018/01/30 21:37   Under 20 years old / High-school/ University/ Grad student / Very /
Purpose of use
Super useful for determining the power of a 2 cm diameter tungsten ball used in a Relative Kinetic Kill Vehicle.
[9]  2017/11/04 07:57   20 years old level / High-school/ University/ Grad student / Very /
Purpose of use
Research into the destructive potential/ Hard Science fiction
[10]  2017/07/25 01:18   60 years old level or over / Self-employed people / Very /
Purpose of use
Generator

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