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Physics - Rotation Question with Solution | TestHub

PhysicsRotationTorque / angular accelerationEasy2 minQB

PhysicsEasysingle choice

Two particles of masses $m$ and $2 m$ are attached to the massless rod of length $2 l$ as shown in figure. The rod is hinged at its midpoint $O$ and is free to rotate in vertical plane about hinge. The minimum speed $v$ at the given instant so that it can complete the circle.

Options:

Answer:

Solution:

$W_{g} = K_{f} - K_{i}$

$m g 2 l - 2 m g 2 l = 0 - [\frac{1}{2} m v^{2} + \frac{1}{2} (2 m) v^{2}]$

$- 2 m g l = - \frac{3}{2} m v^{2}$

$v = \sqrt{\frac{4 g l}{3}}$

Stream:JEESubject:PhysicsTopic:RotationSubtopic:Torque / angular acceleration

⏱ 2mℹ️ Source: QB

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