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Let us dimension analysis.
Critical Velocity  = Vc = K  *  coeff of viscocity^a  * density^b   *  radius^c
       L T^-1 =  K  *  (M L^-1 T^-1)^a    *  (M L^-3)^b    *  L^c
                  =  K    *  M^(a+b)    L^(-a-3b+c)    T^-c
         So      a+b =0  a = -b        -a -3b +c = 1      a = 1      So b = -1      c = -1

  Vc  =  K .  (coeff of visocity) / (density * radius)

1 5 1
it truly depends on the density.the qus.wants the expression of velocity
connection is getting cut in between while i m answering
plz complete the answer sir