two uniform spheres xx and yy roll without slipping along a horizontal surface, as shown above. sphere yy has 22 times the radius, 44 times the mass, and 1212 the translational speed of sphere xx. the rotational inertia of a sphere is 12mr212mr2. if kyky is the kinetic energy of sphere yy , and kxkx in the kinetic energy of xx , what is the ratio kykxkykx ?
