A lump of iron of mass $5\mathrm{.}436$ kg is suspended $($completely immersed$)$ in a brine solution of density $1085$ kg m $-3.$ The volume of the iron is $0\mathrm{.}00069$ m $3$

$.$ Calculate

the new effective weight of the iron object in N $($to $3$ d$.$p$.)$ given g $=9\mathrm{.}81$ ms $-2.$