00:01
Here i'll be looking at the concept of moment of inertia, which is a rotational analog of mass.
00:18
So in other words, if we look at the rotational analog of f equals ma, which is torque equals i times alpha, i is moment of inertia, the larger moment of inertia is the moment of inertia is the harder the object is.
00:40
To rotate in a similar fashion to the larger mass.
00:49
An object has the harder it is to accelerate along a straight line.
00:55
Here we're going to specifically talk about the moment of inertia of a point mass is equal to the mass itself times d squared, where d is the distance to the axis of rotation.
01:18
So this is how it's a little bit different than in a linear sense.
01:24
The distance or radius always matters when it comes to rotations.
01:30
And here as an example, we're going to take a look at an oxygen molecule, which consists of two oxygens with a bond in between them.
01:46
Each of the oxygen nuclei have a mass.
01:51
Here we'll say 5 .3.
01:53
Times 10 to the minus 26 kilograms, which is about 18 times 16 to 18 times the mass of a nucleus, a nucleon, a neutron or proton.
02:10
Let's see.
02:13
And that looks to be oxygen 16, we believe.
02:17
And there's some axis of rotation that is occurring right in between the two...