# A 19 cm long, 230 g rod is pivoted at one end. A 17 g ball of clay is stuck on the other end....

## Question:

A 19 cm long, 230 g rod is pivoted at one end. A 17 g ball of clay is stuck on the other end. What is the period if the rod and clay swing as a pendulum?

## Centre of Mass and Physical Pendulum

Centre of mass is point on an object where whole mass of the body is assumed to be concentrated. And physical pendulum is system of regular or irregular shape vibrating about a mean a position. Where time period is given by

{eq}\begin{align} T = 2 \pi \sqrt{\frac{l}{g}} \end{align} {/eq}

Where {eq}l {/eq} is the effective length of the pendulum.

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Let us recap important information from the question

• Length of the rod {eq}L = 19 \ cm {/eq}
• Mass of the rod {eq}M = 230 \ g {/eq}
• Centre of mass...

Pendulums in Physics: Definition & Equations

from

Chapter 11 / Lesson 6
30K

After watching this lesson, you will be able to explain what a pendulum is, why it is an example of simple harmonic motion, and use equations to solve pendulum problems. A short quiz will follow.