Every time I ask a question on here, I get lots of great answers. I'm sometimes overwhelmed by the collective knowledge that must be on this site. It probably adds up to thousands of years of experience.
So, I'm going to pose another question, a hard question, to see if anyone can answer it. Just as an experiment.
Ok, here goes...
If a quark is travelling 3 nanoseconds below the speed of light. What to the power of R is its mass density?