Which is evidence that a chemical reaction has occurred? a) a phase change occurs b) a new gas is observed in the form of bubbles c) red and yellow paint mixing to make orange paint d) the temperature of the substance remains constant

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,?