Asked by Max
uniform ladder of length 5m and weight 80 newtons stands on rough level ground and rests in equilibrium against a smooth horizontal rail which is fixed 4m vertically above the ground. If the inclination of the ladder to the vertical is x, where tan x is less than 3/4, find expressions in terms of x for the vertical reaction R of the ground, the friction F at the ground and the normal reaction N at the rail.