Final answer:
The equation of motion for a flexible rigid shaft is τ = Iα.
Step-by-step explanation:
The equation of motion for a flexible rigid shaft can be derived using Newton's second law of motion. Newton's second law states that the force acting on an object is equal to the mass of the object multiplied by its acceleration (F = ma).
In the case of rotational motion, the force can be replaced by torque (τ = Iα), where τ is the torque, I is the moment of inertia, and α is the angular acceleration.
Therefore, the equation of motion for a flexible rigid shaft can be written as torque = moment of inertia × angular acceleration (τ = Iα).