an incoming pitcher only gets 8 warm up pitches to keep the game going and to let him get use to the pitching mound. it use to be 12 but it took to long
As many as he needs. If a pitcher replaces another pitcher whom the manager just pulled, then the incoming pitcher gets a maximum of 8 pitches.
It depends on the league. Usually if its a new pitcher he gets 8 pitches. If the pitcher is coming back in for the next inning he usually gets 5 pitches (the total pitches to warm includes a throw-down by the catcher to 2nd base on the last pitch of the warm up)
According to the official MLB rules, section 8, an incoming pitcher is allowed 8 pitches while play is suspended, not to exceed one minute of time. If the pitcher is brought into the game in an emergency situation (i.e. injury or ejection), the umpire-in-chief may allow him as much warm-up as the umpire deems necessary.
New pitcher gets 9. A returning pitcher gets 5.
Well yes if they want to. If they refuse to they have a greater chance of getting hurt if they don't warm up.
Pitchers in MLB and the minor leagues get eight warmup pitches when entering a game unless they are entering the game due to an injury to the previous pitcher. If the previous pitcher was injured the relieving pitcher may take as many warmup pitches as the umpire deems necessary. Rule 8.03
The manager keeps a pitch count as an indicator of the pitcher's probable level of fatigue. The pitchers don't exert as much energy when the pitcher is throwing in the bullpen or warming up as he does during the game. Managers do consider how many times a relief pitcher is asked to warm up, not only that day, but in the few days before, when they decide who to bring in from the bull-pen. Also if the start of a game is delayed after the starting pitcher has warmed up,and so would have to warm again before the game starts, a good manager takes that fact into consideration.
There may be a pitcher somewhere in baseball that can pitch ambidextrous, but there's not much of a call for it in the game. A pitcher may pitch either left or right handed to any batter, but they must use the same hand for that at-bat. The reason it is so rare is because of the many years that it takes for a person to perfect their pitches with just one hand. It's obvious that a pitcher will be much better pitching with one hand than they will be with the other. They also won't be able to throw as hard. A manager needs his pitcher to be able to locate his pitches effectively. It's more than likely too risky for a pitcher to change hands while one arm is warm and the other is cold.