  A relativistic constituent quark model is used to calculate the semileptonic
beta decay of nucleons and hyperons. The parameters of the model, namely, the
constituent quark mass and the confinement scale, are fixed by a previous
calculation of the magnetic moments of the baryon octet within the same model.
We discuss the momentum dependence of the form factors, possible configuration
mixing and SU(3) symmetry breaking. We conclude that the relativistic
constituent quark model is a good framework to analyze electroweak properties
of the baryons.
