An iron cylinder is 0 . 8 m high. How deep will it sink when floating on mercury? ( Fe = 7 8 0

 An iron cylinder is $0\mathrm{.}8$ m high. How deep will it sink when floating on mercury? $($р Fe $=7800$ kg$/$m$\mathrm{³}$ and р Hg $=13600$ kg$/$m$\mathrm{³})$