This quantity is raised to the negative fourth power in the definition of Einstein’s gravitational constant. (-5[1])The slope of a 45 degree line on a Minkowski diagram equals this quantity (10[1])because Minkowski time is scaled by this quantity. The ratio of velocity to this quantity is denoted by beta. By comparing (10[1])interference patterns, this quantity was found (10[1])not to depend on the direction (10[1])of measurement in the Michelson-Morley (10[1])experiment. (10[1]-5[1])The mass-energy equivalence states (read slowly) rest energy equals mass times this quantity squared. For 10 points, name this universal speed limit (10[1])equal to about (10[1])three times ten to the eight meters per second. ■END■