[填空题]
A radioactive nucleus at restj 9qs t,8ja9rq decays9migwupzjen5 sw *txja68y5(n0nh8 9 into a second nucleus, an electron, and a neutrino. The electron and neutrino are emitted at right angles and 5uhjx0tepynn8w a 5j99w(6*8nmigs zhave momenta of $9.30\times10^{-23}kg\cdot m/s$ and $5.40\times10^{-23}\mathrm{~kg}\cdot\mathrm{m/s}$ respectively. What are the magnitude and direction of the momentum of the second (recoiling) nucleus? $ \times10^{-22}$ $^{\circ} $ from the momentum of the electron
