The Pacific Ocean has a surface area of about 166,241,700 km^2 and an average depth of 3940 m. Estimate the volume of the Pacific Ocean in cubic centimeters and in cubic millimeters

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,?