For the setup in the example in Section 13.5.2 (a particle moves with constant speed v around the circle x2+y2=r2, z=0, in the lab frame; at the instant the particle crosses the negative y axis), find the 3-force and 4-force in both the lab frame and the instantaneous inertial frame of the particle. Verify that the 3-forces are related according to Eq. (13.22). (Solve this from scratch; don't just use the results from the example.)