if you are riding on a train that speeds past another train moving in sam direction on an adjacent track it appears that other train is moving backward why?

What are similarities and differences of reflection, refraction, diffraction and absorption?

Explain what it means to view something from a frame of reference. provide an example that illustrates your explanation. (4 points)

During the experiment if you could triple the breakaway magnetic force with all other quantities left unchanged, what is the new value for the critical velocity if it was v0 (initial velocity), initially? (b) now if you halved the radius with all other quantities left unchanged, what is the new critical velocity if it was v0 (initial velocity), initially? (c) if during the experiment, critical velocity quadrupled with all other quantities left unchanged, what is the new breakaway force if its magnitude was initially f0,?