A single square$-$thread screw has an input power of $3\mathrm{.}000$ kW at a speed of $1$ rev$/$s$.$The screw has a diameter of $40$ mm and a pitch of $8$ mm$.$The frictional coefficients are $0\mathrm{.}120$ for the threads and $0\mathrm{.}09$ for the collar, with a collar friction diameter of $50$ mm$.$Find the axial resisting load F and the combined efficiency of the screw and collar if the screw is raising the load.$$