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12 godz. temu · History. The Dirac equation in the form originally proposed by Dirac is:: 291 (+ =) (,) = (,) where ψ(x, t) is the wave function for an electron of rest mass m with spacetime coordinates x, t. p 1, p 2, p 3 are the components of the momentum, understood to be the momentum operator in the Schrödinger equation. c is the speed of light, and ħ is the reduced Planck constant.
12 godz. temu · Sunscreen, also known as sunblock or sun cream, is a photoprotective topical product for the skin that helps protect against sunburn and prevent skin cancer.Sunscreens come as lotions, sprays, gels, foams (such as an expanded foam lotion or whipped lotion), sticks, powders and other topical products.Sunscreens are common supplements to clothing, particularly sunglasses, sunhats and special sun ...
12 godz. temu · Germany, officially the Federal Republic of Germany (FRG), is a country in Central Europe.It lies between the Baltic and North Sea to the north and the Alps to the south. Its 16 constituent states have a total population of over 84 million in an area of 357,600 km 2 (138,100 sq mi), making it the most populous member state of the European Union.It borders Denmark to the north, Poland and ...
12 godz. temu · 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. If m is an object's mass and v is its velocity (also a vector quantity), then the object's momentum p ...
