The figure shows scale drawings of four objects, each of the same mass and uniform thickness, with the mass distributed uniformly. Which one has the greatest moment of inertia when rotated about an axis perpendicular to the plane of the drawing at point P?
A) A
B) B
C) C
D) D
E) The moment of inertia is the same for all of these objects.

Question

The figure shows scale drawings of four objects, each of the same mass and uniform thickness, with the mass distributed uniformly. Which one has the greatest moment of inertia when rotated about an axis perpendicular to the plane of the drawing at point P? 
A) A 
B) B 
C) C 
D) D 
E) The moment of inertia is the same for all of these objects.

Quizplus · Accepted Answer

The moment of inertia of an object depends on its shape and mass distribution. Object B has the majority of its mass distributed farthest from point P, while the other three objects have their mass distributed in a more uniform manner. This means that Object B will have the greatest moment of inertia when rotated about an axis perpendicular to the plane of the drawing at point P.

The Figure Shows Scale Drawings of Four Objects, Each of the Same