Angular Momentum Sum: Calculating Work Done

[manojanand]

The sum is a horizontal rod of mass m, len l is pivoted at one end so that it is free to rotate about a vertical axis...and a steady force fo F units acts at the free end, maintaining a direction perpendiculat to the rod. Wat is the work done by this force during the time tat the rod takeds to complete one turn, assuming that it starts from rest?
i kno its silly to ask this question but still...pls answer

 

[Doc Al]

Consider the definition of work as a force acting through a distance. Over what distance does the applied force act as it completes one turn?