Rotational MotionMedium
Question
Figure shows a uniform disk, with mass M = 2.4 kg and radius R = 20 cm, mounted on a fixed horizontal axle. A block of mass m = 1.2 kg hangs from a mass less cord that is wrapped around the rim of the disk. The tension in cord is
Options
A.12 N
B.20 N
C.24 N
D.None of these
Solution
For block : mg - T = ma ........ (i)
For disk (pulley) TR = Iα =
But α =
so T = 
...(ii)
Therefore
⇒ t = 
For disk (pulley) TR = Iα =
But α =
so T = ...(ii)Therefore
⇒ t = Create a free account to view solution
View Solution FreeMore Rotational Motion Questions
A weightless rod is acted on by upward parallel forces of 2N and 4N at ends A and B respectively. The total length of th...Off two eggs which have identical sizes, shapes and weights, one is raw and the other is half-boiled. The ratio between ...An ant is sitting at the edge of a rotating disc. If the ant reaches the other end, after moving along the diameter, the...The moment of inertia of uniform circular disc is maximum about an axis perpendicular to the discand passing through...A cord is wound over a cylinder of radius r and moment of inertia I. A mass m is attached to the free end of the cord. T...