No
Pat Venditte did, so yeah.
In general, add aboout 20 mph because you are calculating the different pitching lengths. Little league pitchers throw from 45 feet, major leaguers throw from 60.5 feet. For example, a little league pitcher throwing a 70 mph pitch is equivalent to a major league player throwing about a 90 mph pitch.
White. They say it may distract the hitter because the ball is also white.
No. Pitchers can re-enter once in Juniors and above, but there is no re-entry as a pitcher in Majors and below in Little League.
If he is skilled enough
Only if the pitcher warms up on the diamond.
A starting pitcher who is removed cannot re-enter in either league, if he is removed from the game. It's rarely if ever done in Major League baseball, but if a pitcher is removed as a pitcher but placed in another position he can later return to the pitcher position.
46 feet
For little league they are usually 46-60 meaning 46 ft from pitcher to catcher and 60 ft from the bases
Honestly, it varies. I've seen short little league pitchers that are the best. But speaking from what experts would say, the upper 5 feet, 5'8, 5'9, etc. Less then that as well, though. If your a little league pitcher, or your son is, don't let the lack of height get you down. Anything is possible.
from 50-80 depending on the pitcher
one game