Physics - Rotation Question with Solution | TestHub

PhysicsRotationTorque / angular accelerationEasy2 minQB

PhysicsEasyinteger

Find x if the torque about the origin of the force F=i+2j+3k applied at (x,1,−1) is 5i−7j+3k, where i,j,k are Cartesian unit vectors.

Answer:

Solution:

$τ - 1 - 3 x ⟹ x = r \times F = 5 \hat{i} + (- 1 - 3 x) \hat{j} + (2 x - 1) \hat{k} = 5 \hat{i} - 7 \hat{j} + 3 \hat{k} . = - 7, 2 x - 1 = 3 = 2.$

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

⏱ 2mℹ️ Source: QB

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