1. The problem statement, all variables and given/known data If a proton with a kinetic energy of 6 MeV is traveling in a particle accelerator in a circular orbit of radius 0.75m, what fraction of its energy does it radiate per second? m = 1.67 * 10^-27 epsilon_0 = 8.854 * 10^-12 c = 3 * 10^8 2. Relevant equations dE/dt = (q^2 a^2) / (6*π*Epsilon_0 *c^3) 3. The attempt at a solution E_kin = 6*1.6*10^-19*10^6 J calculation of velocity by means of E_kin = 0.5 * m * v^2 v = 0.3397*10^8 ms^-1 v = distance/time a = derivative of v = -d/v^2 using the equation (Larmor formula) above I calculated 6.55*10^-39 J/s that are radiated. What bugs me, is that I didn't use the given radius and I pretty sure I'm supposed to use it but I don't know how I'd really appreciate your help!