Standard gravity

The standard acceleration due to gravity (or standard acceleration of free fall), sometimes abbreviated as standard gravity, usually denoted by ɡ₀ or ɡ_n, is the nominal gravitational acceleration of an object in a vacuum near the surface of the Earth. It is defined by standard as 7000980665000000000♠9.80665 m/s², which is exactly 7000980665000000000♠35.30394 km/(h·s) (about 7000980663520000000♠32.174 ft/s², or 7000980671648000000♠21.937 mph/s). This value was established by the 3rd CGPM (1901, CR 70) and used to define the standard weight of an object as the product of its mass and this nominal acceleration. The acceleration of a body near the surface of the Earth is due to the combined effects of gravity and centrifugal acceleration from rotation of the Earth (but which is small enough to be neglected for most purposes); the total (the apparent gravity) is about 0.5 percent greater at the poles than at the equator.

Although the symbol ɡ is sometimes used for standard gravity, ɡ (without a suffix) can also mean the local acceleration due to local gravity and centrifugal acceleration, which varies depending on one's position on Earth (see Earth's gravity). The symbol ɡ should not be confused with G, the gravitational constant, or g, the symbol for gram. The ɡ is also used as a unit for any form of acceleration, with the value defined as above; see g-force.

Sungha Jung

Sungha Jung (Korean: 정성하) is a South Korean musician who specializes in acoustic fingerstyle guitar. He is also popularly known as Prince of guitar. His YouTube channel currently has more than 3 million subscribers. Jung creates acoustic covers and arrangements, typically by ear and/or by watching videos, and has original music, which he plays and uploads online. He was nicknamed the "Guitar Prodigy" and the "August Rush" in Korea, though he prefers to be known as a 'guitarist' rather than a 'guitar prodigy'.

Biography