In 1851 Jean Bernard Leon Foucault Demonstrated the Rotation of the Earth

Multiple Choice

In 1851 Jean Bernard Leon Foucault demonstrated the rotation of the earth using a pendulum 11.0 m long, which was set up in the Paris Observatory. How long would it have taken for Foucault's pendulum to make one complete swing back to its starting point if $g = 9.81 \mathrm {~m} / \mathrm { s } ^ { 2 }$ at the observatory?

A) 5.63 s
B) 2.58 s
C) 2.12 s
D) 1.79 s
E) 6.65 s