Physics - Rotation Question with Solution | TestHub

PhysicsRotationTorque / angular accelerationEasy2 minPYQ_2022

PhysicsEasynumerical

A metre scale is balanced on a knife edge at its centre. When two coins, each of mass $10 g$ are put one on the top of the other at the $10.0 cm$ mark the scale is found to be balanced at $40.0 cm$ mark. The mass of the metre scale is found to be $x \times 10^{- 2} kg$ . The value of $x$ is _____ .

Answer:

6.00

Solution:

Let the mass of the scale be $m$ .

The centre of mass of the scale will be at $50 cm$ .

Applying torque balance,

$0 = m g \times (50 - 40) - 2 \times 10 g \times (40 - 10) \Rightarrow m = 60 g = 6 \times 10^{- 2} kg$

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

⏱ 2mℹ️ Source: PYQ_2022

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