Mechanics Problem: Time Period of Simple Pendulum with Uniform Rod and Mass m

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SUMMARY

The discussion focuses on calculating the time period of a simple pendulum when the string is replaced by a uniform rod of length L and mass M. The problem highlights that the center of mass (CG) of the system has shifted due to the rod's mass, transforming the pendulum into a physical pendulum. The moment of inertia plays a crucial role in determining the period of oscillation, necessitating the derivation of the exact relationship between these parameters.

PREREQUISITES
  • Understanding of physical pendulum dynamics
  • Knowledge of moment of inertia calculations
  • Familiarity with center of mass concepts
  • Basic principles of oscillatory motion
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  • Derive the time period formula for a physical pendulum
  • Calculate the moment of inertia for a uniform rod about its end
  • Explore the effects of varying mass on the oscillation period
  • Study small angle approximations in pendulum motion
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Students studying classical mechanics, physics educators, and anyone interested in the dynamics of pendulum systems.

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Homework Statement



In a simple pendulum the string supporting the bob is replaced by a uniform rod of length L and mass M.Find the nw time period for small oscillations.Mass of the bob m.

Any help how to do it correctly?

Homework Equations


The Attempt at a Solution



Any help how to do it correctly?
 
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i guess the mass of string was neglected
and now since the rod has mass M, the CG of the system has changed
 
Basically, this is a physical pendulum now. Sure, the centre of mass has changed. So has the moment of inertia. If I remember right, the moment of inertia of a physical pendulum determines its period, but you'll have to derive the exact relation.
 

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