A $10-mm($D$)$ diameter Brinell hardness indenter produced an indentation of $2\mathrm{.}5-mm($d$)$ in diameter in a steel alloy when a load of $1000-kg$ was used. Calculate the Brinell Hardness Number $($HB$).$ Also calculate the tensile strength given your calculated hardness number.

$HB=2\frac{\text{l}\text{o}\text{a}\text{d}\text{,}kg}{}(D)[D-(D^2-d^2{)}^{\frac{1}{2}}]$