In a classic (or early) experiment to determine how large the forces are that allow leaves to pull water from the soil, the rate at which water flowed from a reservoir into the cut tip of an actively transpiring plant was the flow rate through the branch tip when it was subsequently attached to a vacuum pump.

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,?