A 8.4-kg mass is placed at (3.0,4.0)m.Where can a 4.2-kg mass be placed so that the moment of inertia about the z axis is zero?
A) (−3.0,−4.0)m
B) (−6.0,−8.0)m
C) (−1.5,−2.0)m
D) There is no position giving this result.

Question

Quizplus · Accepted Answer

The moment of inertia cannot be zero for a system of masses about an axis unless all masses are at the axis itself, which is not possible here.

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