A turntable rotates counterclockwise at 78 rpmrpm . A speck of dust on the turntable is at 0.46 radrad at t=0t=0. What is the angle of the speck at ttt = 8.0 ss ? Your answer should be between 00 and 2π2π radrad. Express your answer in radians to two significant figures.

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,?