Laboratory centrifuge. A laboratory centrifuge is a piece of laboratory equipment, driven by a motor, which spins liquid samples at high speed. There are various types of centrifuges, depending on the size and the sample capacity.
In American football, each team is allowed 11 men on the field during a play, for a total of 22 players plus the officials.  If there are more than 11 players on the field foâ¦r a play, the team with too many players may be assessed a 5-yard penalty and any play that occurred may be nullified (at the discretion of the opposing team).
A diagram showing an I formation on offense and a 4-3 formation on defense. In American football, each team has 11 players on the field at one time. The specific role that a player takes on the field is called their position. Under the modern rules of American football, teams are allowed unlimited substitutions; that is, teams may change any number of players after any play.