Question

A woman with a mass of 52.0 kg is standing on the rim of a large disk that is rotating at an angular velocity of 0.470 rev/s about an axis through its center. The disk has a mass of 118 kg and a radius of 3.90 m. Calculate the magnitude of the total angular momentum of the woman-plus-disk system. (Assume that you can treat the woman as a point.)

Answer 1

Step-by-step explanation:

It is given that,

Mass of the woman, m₁ = 52 kg

Angular velocity,
`\omega=0.47\ rev/s=2.95\ rad/s`

Mass of disk, m₂ = 118 kg

Radius of the disk, r = 3.9 m

The moment of inertia of woman which is standing at the rim of a large disk is :

`I={m_1r^2}`

`I={52* 3.9^2}`

I₁ = 790.92 kg-m²

The moment of inertia of of the disk about an axis through its center is given by :

`I_2=(m_2r^2)/(2)`

`I_2=(118* (3.9)^2)/(2)`

I₂ =897.39 kg-m²

Total moment of inertia of the system is given by :

`I=I_1+I_2`

`I=790.92+897.39`

I = 1688.31 kg-m²

The angular momentum of the system is :

`L=I* \omega`

`L=1688.31 * 2.95`

`L=4980.5\ kg-m^2/s`

So, the total angular momentum of the system is 4980.5 kg-m²/s. Hence, this is the required solution.