A 8.4-kg mass is placed at (4.0,5.0)m.Where can a 4.2-kg mass be placed so that the moment of inertia about the z axis is zero?
A) (−4.0,−5.0)m
B) (−8.0,−10)m
C) (−2.0,−2.5)m
D) (2.0,2.5)m
E) There is no position giving this result.

Question

A 8.4-kg mass is placed at (4.0,5.0)m.Where can a 4.2-kg mass be placed so that the moment of inertia about the z axis is zero?
A) (−4.0,−5.0)m
B) (−8.0,−10)m
C) (−2.0,−2.5)m
D) (2.0,2.5)m
E) ​There is no position giving this result.

Quizplus · Accepted Answer

The moment of inertia cannot be zero for a non-zero mass distribution about an axis, as it depends on the mass and its distance from the axis.

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