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In Newtonian mechanics, momentum (pl.: momenta or momentums; more specifically linear momentum or translational momentum) is the product of the mass and velocity of an object. It is a vector quantity, possessing a magnitude and a direction.
The moment of force, or torque, is a first moment: =, or, more generally, .; Similarly, angular momentum is the 1st moment of momentum: =.Momentum itself is not a moment.; The electric dipole moment is also a 1st moment: = for two opposite point charges or () for a distributed charge with charge density ().
September 7, 1997 2 "Submarines" Coral reefs; nuclear sub; the Titanic. September 14, 1997 3 "Special Effects" Special effects; movie makeup; illusions; robots; fake blood. September 21, 1997 4 "Zoos" Learning how zoos and biodome environments are as close to animal natural habitats as possible. September 28, 1997 5 "Cool Cars"
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In relativity, the COM frame exists for an isolated massive system.This is a consequence of Noether's theorem.In the COM frame the total energy of the system is the rest energy, and this quantity (when divided by the factor c 2, where c is the speed of light) gives the invariant mass of the system:
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A moment (momentum) is a medieval unit of time. The movement of a shadow on a sundial covered 40 moments in a solar hour, a twelfth of the period between sunrise and sunset. The length of a solar hour depended on the length of the day, which, in turn, varied with the season. [1]
GM sold nearly 21,000 EVs in the U.S. in July and August — almost matching its full second-quarter EV sales. GM’s EV sales through August were up about 70% compared with a year earlier.