Rotational MotionHard
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
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