A turnbuckle, with right and left hand single start threads, is used to couple two wagons. Its thread pitch is 12 mm and mean diameter 40 mm.

A turnbuckle, with right and left hand single start threads, is used to couple two wagons. Its thread pitch is 12 mm and mean diameter 40 mm. The coefficient of friction between the nut and screw is 0.16.

1. Determine the work done in drawing the wagons together a distance of 240 mm, against asteady load of 2500 N.

2. If the load increases from 2500 N to 6000 N over the distance of 240mm, what is the work to be done?