A 120 kg satellite has a radius of gyration of 600 mm with respect to the y axis and is symmetrical with respect to the zx plane. Its oreintation is hcanged by firing four small rockets a,b,c, and d each of which produces a 16.20 N thrust directed as shown. Determine the angular acceleration of the satellite and the acceleration of its mass center G (a) when all four rockets are fired and (b) when all rockets expect for D are fired.