(d) At the time of slipping maxnimum friction acts on the body
in the frame of rod,
`mg sin theta=muN+mr omega^(2)`
Also, " " `N-mg cos theta`
`:. " " mg sin theta=mumgcostheta+mromega^(2)`
`Here, " " r=0.4.5m, theta=50^(@)`
`sin50^(@)=0.766 "and " cos 50^(@)=0.64`
`:.mu=(mgsintheta-mromega^(2))/(mg costheta)=(gsintheta-romega^(22))/(gcostheta)=0.55`