Classical mechanics problem

[Antonio18]

Homework Statement

Good afternoon,I am an aerospace engineering student and I have some problems with an exercise in classical mechanics from a university exam so I need some help solving it.

Relevant Equations

Forces and momentum equations for Newton

 

[berkeman]

Welcome to PF.

Can you translate it into English please? Thanks.

Also, you need to show your best efforts to work the problem before we can offer tutorial help. Can you show us your work so far?

 

[Baluncore]

OCR of the screen.
2)
The system in the figure consists of a ring of mass m and radius 3R, two disks of mass m and radius R, and a disk A of mass 1.5m and radius R, all rigidly connected. The system can rotate about the fixed bar 1. If the system is released from rest at a position of 50° with respect to the vertical, determine, as a function of mass:
a) The angular acceleration of the system in the initial position.
b) The reaction force with the ground when the system is at 90° from the vertical.
Given: ρ_i = 0.2 and ρ₀ = 0.1; Each square is 2 cm; g = 10 m/s².

 

[nasu]

I think aro means ring.

 

[wrobel]

The angular acceleration of the system in the initial position.

Angular acceleration is a vector defined for a rigid body, not a system of rigid bodies. As a whole, it's a great problem — practically impossible to understand.

 

[Baluncore]

a) La aceleracién angular del sistema en la posición inicial.

Angular acceleration is a vector defined for a rigid body, not a system of rigid bodies.

... , todos unidos rígidamente.

todos unidos rígidamente. = all united rigidly.

... , all rigidly connected.

It is a single rigid system of bodies, rotating about a single fixed axis.

 

[berkeman]

Antonio's profile says he is in Europe, so let's give them over night (US time) to respond and show their work on the problem. Thanks folks.