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Moment of inertia is

  • A.Vector
  • B.Scalar
  • C.Phasor
  • D.Tensor

Answer: D

Moment of inertia is a tensor.

For rotation about a fixed axis it can be treated as a single number, but in general the angular momentum is not parallel to the angular velocity, and the relation between them requires a \(3\times3\) inertia tensor. Only for rotation about a principal axis do the two vectors line up.

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