A 2.8-NN force is applied to the plunger of a hypodermic needle. Part A If the diameter of the plunger is 1.3 cmcm and that of the needle 0.21 , with what force does the fluid leave the needle

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,?