This has been true for all twenty of the US metropolitan areas with the largest populations; some of which have had TWO NFL and MLB teams at the same time.
Chicago & New York
That would be the Chicago Cubs who have played in Chicago since 1876.
It is the same shape as a major league infield
The same as in Major League Baseball and all levels of the game from high school on up.
The same as major league baseball. The only thing that is different is that the bases are 30 feet instead of 90 feet.
To settle the "question" of which major league baseball team is the best. It's the same reason there are playoffs in all major sports.
2003- 2004 New England Patriots and 2004 Boston Red Sox
The same as a major league baseball, 9.25 ounces. IMPROVED ANSWER: Same as MLB with the exception of T-Ball Balls. The T Ball balls are lighter and don't have as much "bounce".
By rule there is no limit.
Chipper jones
Ken Griffey, Jr & Sr.
it varies, from under 300 feet to well over 400 feet.