where \(I_{p}\) is the moment of inertia of the pulley, \(I_{r}\) is the moment of inertia of the rod, and \(I_{b}\) is the moment of inertia of the test body, which is what we're trying to measure. T...where \(I_{p}\) is the moment of inertia of the pulley, \(I_{r}\) is the moment of inertia of the rod, and \(I_{b}\) is the moment of inertia of the test body, which is what we're trying to measure. The pulley and rod are both disks, so their respective moments of inertia are \(I_{p}=\frac{1}{2} m_{p} r_{p}^{2}\) and \(I_{r}=\frac{1}{2} m_{r} r_{r}^{2}\), where \(m_{p}\) and \(r_{p}\) are the mass and radius of the pulley, and \(m_{r}\) and \(r_{r}\) the mass and radius of the rod.
