A single square$-$thread screw has an input power of $3\mathrm{.}000$ kW at a speed of $1\backslash (\backslash$mathrm$\{$rev$\}/\backslash$mathrm$\{$s$\}\backslash ).$ The screw has a diameter of $40$ mm and a pitch of $8$ mm $.$ The frictional coefficients are $0\mathrm{.}180$ for the threads and $0\mathrm{.}09$ for the collar, with a collar friction diameter of $50$ mm $.$ Find the axial resisting load $\backslash ($ F $\backslash )$ and the combined efficiency of the screw and collar if the screw is raising the load.

The axial resisting load $\backslash ($ F $\backslash )$ is

kN $.$

The combined efficiency of the screw and collar is

$\backslash \%.$