Dado los vectores a= 2i + xj y b= 6i. el valor de x para que la magnitud de b sea igual a tres veces la magnitud de a x b es:

The law of the conservation of momentum says that the total momentum of any closed and isolated system cannot

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Aparticle of mass m is placed in a one-dimensional box of length l. the box is so small that the particle’s motion is relativistic, so that e p2/2m is not valid. (a) derive an expression for the energy levels of the particle using the relativistic energy–momentum relation and the quantization of momentum that derives from connement. (b) if the particle is an electron in a box of length l 1.00 1012 m, nd its lowest possible kinetic energy. by what percent is the nonrelativistic formula for the energy in error?