Physics - Rotation Question with Solution | TestHub

PhysicsRotationCalculation of M.I.Medium2 minPYQ_2021

PhysicsMediumnumerical

A solid disc of radius $20 cm$ and mass $10 kg$ is rotating with an angular velocity of $600 rpm$ , about an axis normal to its circular plane and passing through its centre of mass. The retarding torque required to bring the disc at rest in $10 s$ is _________ $π \times 10^{- 1} N m$

Answer:

4.00

Solution:

$τ = \frac{Δ L}{Δ t} = \frac{I (ω_{f} - ω_{i})}{Δ t}$

$τ = \frac{\frac{m R^{2}}{2} \times [0 - ω]}{Δ t}$

$= \frac{10 \times {(20 \times 10^{- 2})}^{2}}{2} \times \frac{600 \times π}{30 \times 10}$

$= 0.4 π = 4 π \times 10^{- 1}$

Stream:JEESubject:PhysicsTopic:RotationSubtopic:Calculation of M.I.

⏱ 2mℹ️ Source: PYQ_2021

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