$[$Hadamard$-$Rybczynski problem$]$ A liquid drop $($radius R$,$ viscosity $\_$i$,$ density $\_$i$)$ is under a uniform flow field v$\_$ $\_$z of another liquid $($viscosity $\_$o$,$ density $\_$o$).$ Assume that the liquid drop maintains its spherical shape and surface tension is neglected. Two liquids are both Newtonian and immiscible with each other. Define the ration between the two liquids as $=$$\_$i$/$$\_$o$,$ so that if $->$$,$ it is a solid sphere, and if $=0,$ it is a bubble.