Physics - Rotation Question with Solution | TestHub
PhysicsRotationTorque / angular accelerationMedium2 minQB
PhysicsMediumsingle choice
A disk of radius 2R and mass 'M' is hinged from its center. If a disk of radius R been removed such that radius of bigger disk behave as a diameter of the disk and it is welded on the opposite side as shown in diagram.Find the angular acceleration of the system in case-II if the system is released from the given position about the axis passing through O and perpendicular to the plane of disc:-
Options:
Answer:
D
Solution:
The removed quarter-mass disc moves through a distance 2R. The centre-of-mass displacement is xCM=[(M/4)R+(M/4)R]/M=R/2. The torque is τ=MgR/2. With I=2MR², α=τ/I=(MgR/2)/(2MR²)=g/(4R).
Stream:JEESubject:PhysicsTopic:RotationSubtopic:Torque / angular acceleration
⏱ 2mℹ️ Source: QB
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