A radioactive nucleus, initially at rest, decays by emitting an electron and a neutrino at right angles to one another. The momentum of the electron is 1.2 x 1022 kg m/s and that of the neutrino is 6.4 x 10 23 kg m/s. (a) Find the direction and magnitude of the momentum of the recoiling nucleus. (b) The mass of the residual nucleus is 5.8 x 1026 kg. What is its kinetic energy of recoil?

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