Why does the 2001 f-150 drive fine at speeds below 50 mph but seems to run a little rough at speeds above 55 mph it does't do this all the timewhile driving?
get your tires balanced and make sure the air presure is the same in both of them
"To the point of superconducting" makes little sense in this context. What, specifically, is superconducting? the little wire traces between the transistors? If you made a computer "really really cold", you can overclock it / run it at above nominal speeds. This is really the only reason to "supercool" a computer.
conventional jet engines (using a compressor) will operate at speeds up to slightly less than Mach 1 using an afterburner a conventional jet engine can operate at speeds slightly above Mach 3 ramjet engines will operate at speeds up to about Mach 5 scramjet engines can operate at speeds well above Mach 6 However the maximum speed of of an actual airplane is usually less than the capability of the engines it uses.