Now that we’ve seen that the change in the momentum of the cart-disk system is a decrease of just a few percent, let’s compare the kinetic energy before and after the collision as well. Calculate the percent change in kinetic energy of the cart-disk system resulting from the collision. Express your answer as a positive or negative percentage to three significant figures, to indicate either an increase or decrease in kinetic energy.

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The total amount of energy contained in an object

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?