  We develop a model of a binary fermionic mixture, consisting of large number
of atoms, applicable at nonzero temperatures, in the normal phase. We use this
approach to study dynamics of degenerate Fermi systems under various
perturbations. For example, we analyze spin-dipole oscillations of a
two-component fermionic mixture, demonstrating that the ferromagnetic phase
shows up at stronger repulsion between components while the temperature raises.
We study as well the radial oscillations of weakly interacting repulsive Fermi
gases. We obtain a good agreement with experimental data when available.
Otherwise, we compare our results with the outcome of the Hartree-Fock orbital
calculations done for the system with small number of fermions.
