Upper edges of two identical uniform planks each of mass M

Last updated: 6/21/2023

Upper edges of two identical uniform planks each of mass M 87 kg and length 1 1 0 m are hinged to a horizontal axle affixed to the ceiling A cylinder of mass m 20 kg and radius r 0 30 m is inserted horizontally between the planks as shown The cylinder touches the planks at a distance 77 0 75 times the length of the plank from the hinge Find range of coefficient of friction between the planks and the cylinder to keep the system in equilibrium s