Determine the frequency of torsional vibration of a shaft with 2 circular disks of uniform thickness. Disk 1 weighs 450 kg and has a diameter of 1.25 m. Disk 2 has a weight of 900.0 kg and a diameter of 2.00 m. The length of the shaft is 3.00 m and has a diameter of 100.0 mm. All components are steel. Where is the nodal cross section?
Shear Modulus: G = 79 GPa
Young's Modulus: E = 200 GPa
σ_yield: 250 MPa
ρ: 7860 kg/m^3