(a) By modelling the ballerina with her arms and legs tucked in as a uniform cylinder of mass 60kg and radius 13cm, find her angular momentum after she has tucked her arms in. The moment of inertia of a uniform cylinder of mass M and radius R is given by I =,MR (b) Hence, estimate her moment of inertia with respect to her axis of rotation when her arms and legs were outstretched.
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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