# What is the moment of inertia of a pendulum with a mass of #8 kg# that is #1 m# from the pivot?

##### 1 Answer

Apr 23, 2018

#### Answer:

#### Explanation:

Taking the pendulum bulb as a point mass and the pivot as the rotational axis,

Moment of inertia of the bulb as a point mass: [1]

Note that the momentum of inertia expression can be derived using the parallel axis theorem: [2]

Where

Hence

**Reference**

[1] List of moments of inertia, the English Wikipedia, https://en.wikipedia.org/wiki/List_of_moments_of_inertia

[2] Parallel axis theorem, the English Wikipedia, https://en.wikipedia.org/wiki/Parallel_axis_theorem