Physics - Rotation Question with Solution | TestHub

PhysicsRotationTorque / angular accelerationMedium2 minQB

PhysicsMediumsingle choice

A conical pendulum consists of a mass $M$ suspended from a string of length $ℓ$ . The mass executes a circle of radius $R$ in a horizontal plane with speed $v$ . At time $t$ , the mass is at position $R \hat{i}$ and has velocity $v \hat{j}$ . At time $t$ , the angular momentum vector of the mass $M$ about the point from which the string suspended is :

Options:

Answer:

Solution:

$L = r \times p$

$L = [ℓ - R^{2} (- \hat{k}) + R \hat{i}] \times [M v \hat{j}] = M v ℓ [\frac{ℓ ^{2} - R ^{2}}{ℓ} \hat{i} + \frac{R}{ℓ} \hat{k}]$

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

⏱ 2mℹ️ Source: QB

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