A Cube Balanced with One Edge in Contact with a Table

Multiple Choice

A cube balanced with one edge in contact with a table top and with its center of gravity directly above the edge is in ________ equilibrium with respect to rotation about the edge and in ________ equilibrium with respect to rotation about a horizontal axis that is perpendicular to the edge.

A) stable, stable
B) stable, unstable
C) unstable, stable
D) unstable, unstable
E) unstable, neutral