longitudinal mass

longitudinal mass

[‚län·jə′tüd·ən·əl ′mas]
(relativity)
The ratio of a force acting on a relativistic particle in the direction of its velocity to the resulting acceleration; equal to m0(1-v 2/ c 2)-3/2, where m0 is the particle's rest mass, v is its speed, and c is the speed of light.
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