The Radium (Ra) nucleus decays as follow, 88Ra 226 → ZRn A + 2He 4 (a) What type of radioactive decay is this? (b) Find the atomic mass number A and the proton number Z of the resulting Radon (Rn) nucleus. (c) Given the masses (expressed in atomic mass unit, u) are 226.025410u for Radium, 222.017578u for Radon and 4.002603u for Helium and the square of the speed of light, c 2 , is 931.494 MeV/u, calculate the energy released in this nuclear decay

Two manned satellites approaching one another at a relative speed of 0.550 m/s intend to dock. the first has a mass of 2.50 ✕ 103 kg, and the second a mass of 7.50 ✕ 103 kg. assume that the positive direction is directed from the second satellite towards the first satellite. (a) calculate the final velocity after docking, in the frame of reference in which the first satellite was originally at rest.(b) what is the loss of kinetic energy in this inelastic collision? (c) repeat both parts, in the frame of reference in which the second satellite was originally at rest. final velocity(d) loss of kinetic energy = ?