Scientists design a new particle accelerator in which protons (mass 1.7 * 10-27 kg) follow a circular trajectory given by r = c cos(k t -) i + c sin(k t 2) j, where c = 4.55 m and k = 9.0 * 104 rad/s are constants and t is the elapsed time. What is the magnitude of the force on the proton at t = 2.0 s? Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: x10