In a specific ballet move called pirouette, the ballerina spins on her toes. She can control the speed of the spin by adjusting the position of her arms and legs. l oft [ Note: you can consider model the ballerina with her arms and legs tucked in a uniform cylinder of mass 55 kg and radius 13 cm.] You can understand the axis of rotation of her spin, right? Let's consider for the last t = 15 sec, she is spinning with a constant angular speed o = 1/3 rad/s . Which of the following is true regarding the tangential acceleration of her spin? (a) Tangential acceleration is zero for the time being, (b) You can't find the tangential acceleration with the given information. (c) Tangential acceleration is not zero but insufficient information is given. (d) Tangential acceleration a, = 13n/6 m/s² O (b) O (d)
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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