A rope is wound round a fixed cylinder of radius r so as to make n complete turns . Show that if one end of the rope is held by a force f, a force f e^2(pi)nu must be applied to the other end to produce slipping,where u is the coeff. of friction between rope and cylinder. Find also the work required to turn the cylinder through one complete turn under these conditions.

Answer 1

http://www.jiskha.com/display.cgi?id=1394740694#1394740694.1394743546

Answer 2

I did not understand the part of the normal force..how did you gt that?