- #1

heyall

- 2

- 0

## Homework Statement

A thin disk is 100g.

It's diameter is 20cm.

It's thickness is 2cm.

Rotation is about the central axis (ie. perpendicular to the symmetrical plane).

Answer in kg*m

^{2}

## Homework Equations

I=(1/2)MR

^{2}

M is the mass

R is the radius

I is the moment of inertia

## The Attempt at a Solution

R = half the diameter ∴ R = 10cm

I= (.5)(.1)(.1)

^{2}

I= 0.0005 = 5*10^

^{-4}

I don't think the thickness matters as long as it is symmetrical all around.

The reason I ask is because this question is a multiple choice question for marks, but the answer I found (0.0005) wasn't listed as one of the options. Thanks!