Difficult# Physical Pendulum: Differential Equation

APPHMC-7QIHYR

The uniform rod shown below has a length $l$, mass $m$, and pivots around point P at one end. The rotational inertia of the rod around its endpoint is $\frac { 1 }{ 3 } m{ l }^{ 2 }$.

Which is the correct, simplified differential equation for describing the motion of this physical pendulum for small angles of oscillation?