There are two homogeneous bars of equal length and shape. Both are pivoted as shown in the figure at one of their ends, If the bars are made of different materials, and it is known that the celestial bar has a higher density than the green bar, if we consider the moment of inertia with respect to the pivot shown in the figure, it would be correct to say that: a) The moment of inertia of the celestial bar is greater than that of the green one. b) The moment of inertia of both bars is equal to and different from zero. c) The moment of inertia of both bars is zero because they are at rest. d) The moment of inertia of the blue bar is less than that of the green one.
Rigid Body
A rigid body is an object which does not change its shape or undergo any significant deformation due to an external force or movement. Mathematically speaking, the distance between any two points inside the body doesn't change in any situation.
Rigid Body Dynamics
Rigid bodies are defined as inelastic shapes with negligible deformation, giving them an unchanging center of mass. It is also generally assumed that the mass of a rigid body is uniformly distributed. This property of rigid bodies comes in handy when we deal with concepts like momentum, angular momentum, force and torque. The study of these properties – viz., force, torque, momentum, and angular momentum – of a rigid body, is collectively known as rigid body dynamics (RBD).
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