22 A bar of mass m is held as shown between 4 disks, each of mass m' - Physics - System Of Particles And Rotational Motion

Question

22 A bar of mass m is held as shown between 4 disks, each of mass
m' & radius r=75mm Determine
acceleration of the bar immediately after it has been released from
rest, knowing that the normal forces exerted on the disks are
sufficient to prevent any slipping and assuming that;

(a) m = 5 kg and m' = 2kg
(b) the mass of m' of the disks is negligible
(c) the mass of m of the bar is negligible

Shobhit Mittal · Accepted Answer

Dear Student,

let the accn be asince rolling is their let the friction be constant f from one ring mg-4f=matorque on the disc=rfα=rfm'r2/2=2fm'r=2f2*0
075a=rαa=r2fm'r=2fm'f=m'a/2mg-4m'a2=ma50-2*2a=5a9a=50a=50/9 m/s2Regards