Now that you understand something about electrostatics and static electricity, it is easy to understand the purpose of the Van de Graaff generator. A Van de Graaff generator is a device designed to create static electricity and make it available for experimentation. The American physicist Robert Jemison Van de Graaff invented the Van de Graaff generator in 1931. The device that bears his name has the ability to produce extremely high voltages -- as high as 20 million volts. Van de Graaff invented the generator to supply the high energy needed for early particle accelerators.
If a player pitches 46 - 60 pitches in a day, two (2) calendar days of rest must be observed. If a player pitches 31 -45 pitches in a day, one (1) calendar day of rest must be observed. If a player pitches 1-30 pitches in a day, no (0) calendar day of rest is required.f a player pitches 46 - 60 pitches in a day, two (2) calendar days of rest must be observed. If a player pitches 31 -45 pitches in a day, one (1) calendar day of rest must be observed. If a player pitches 1-30 pitches in a day, no (0) calendar day of rest is required.
Although the new pitching distance is mandatory beginning with the 2010-11 school year, NFHS-member state high school associations may adopt the 43-feet distance in 2009-10, if desired. After at least 10 years of debate by committee members, the NFHS has extended the fast-pitch pitching distance to 43 feet.