For closed systems with no external source or sink of energy, the first law of thermodynamics states that a system's energy is constant unless energy is transferred in or out by mechanical work or heat, and that no energy is lost in transfer. This means that it is impossible to create or destroy energy.
GROGAN. The Irish name Grogan is derived from the native Gaelic O'Gruagain Sept that was initially located in County Roscommon but which became widely dispersed. The name is derived from a Gaelic word meaning 'fierceness'. Grugan, Groggan, Groogan and O'Grogan are among the variants of this name.he Irish name Grogan is derived from the native Gaelic O'Gruagain Sept that was initially located in County Roscommon but which became widely dispersed.
Look up Gregory in Wiktionary, the free dictionary. Gregory is a masculine first name. It is derived from the Latin name Gregorius, which was from the late Greek name Î³ÏÎ·Î³ÏÏÎ¹Î¿Ï (GrÄgorios) meaning watchful, alert (derived from Greek Î³ÏÎ·Î³oÏÎµá¿Î½ grÄgorein meaning to watch).Through folk etymology, the name also became associated with Latin grex (stem gregâ) meaning 'flock' or 'herd'.This association with a shepherd who diligently guides his flock contributed to the name's popularity among monks and popes.hrough folk etymology, the name also became associated with Latin grex (stem gregâ) meaning 'flock' or 'herd'. This association with a shepherd who diligently guides his flock contributed to the name's popularity among monks and popes.