Q$4$ A single start square threaded screw is to be designed for a C$-$Clamp, the axial load on the screw may be assumed to be $10KN.$ A thrust pad is attached at the end of the screw whose mean diameter may be taken as $30mm,$ coefficient of friction for the screw threads and the thrust pads is $0\mathrm{.}12$ and $0\mathrm{.}08$ respectively. The allowable tensile strength of the screw is $60$MPa and the allowable bearing pressure is $12$MPa. The square thread as under:

$\backslash$table$[[$Nominal dia. $(mm),25,28,31,35],[$Core dia. $(mm),19,22,25,27],[$Pitch $(mm),5,5,5,6]]$

Requirements:

Which dimension is suitable for screwing out of the four values given in the table?

If the force of the person on the handle is $100N,$ find the length and diameter of the lever if the allowable bending stress of the lever is $40$MPa.

Draw a sectional front view of the system.