When it comes to upper pecs, the study found that the incline bench is just slightly more effective than the flat or decline bench. The study also tested grips, and found that a narrower grip (just beyond shoulder width) combined with an incline bench press is the best for those upper pecs.
You are currently converting speed units from speed of light to miles per hour. 1 c = 670616629.3844 mph. speed of light. c. miles per hour. 670616629.3844 mph.
No, according to [1], which is referenced by Wikipedia, the leader travels at 61 km/s and the return stroke at 27800 km/s. These speeds are much less than the speed of light (299792 km/s). This is because the leader moves in steps of several tens on metres in less than a microsecond (Î¼s), but these steps have an interval of the order of 50 Î¼s.