Conceptual Question on Rotational Mechanics

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Homework Help Overview

The discussion revolves around a conceptual question in rotational mechanics, specifically regarding the velocity of systems of masses connected by rods that rotate about a midpoint. The original poster is questioning whether the systems, which appear to rotate in unison, have the same velocity.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • The original poster suggests that the systems have the same velocity based on their unison rotation. Other participants question the necessity of a diagram and clarify that unison rotation may imply the same rotational velocity, while also probing what is meant by "velocity" in this context.

Discussion Status

The discussion is active, with participants exploring the implications of the term "unison" and questioning the specifics of what is meant by velocity. Some guidance has been offered regarding the interpretation of the question, but no consensus has been reached.

Contextual Notes

There is a mention of a missing diagram that may be relevant to the problem setup, and participants are navigating the definitions and assumptions related to velocity in the context of rotational motion.

master_333
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Homework Statement


Rods of negligible mass connect discrete masses as shown in the diagram below. For each system, the masses rotate about the midpoint of each connecting rod. Furthermore the systems appear to rotate in unison as time progresses. Do the systems have the same velocity?

Homework Equations

The Attempt at a Solution


I think the answer is yes because the the question says that the systems appear to rotate in unison.

Could someone please tell me if I am correct?
 
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master_333 said:
Rods of negligible mass connect discrete masses as shown in the diagram below.
You forgot the diagram.
 
You don't need the diagram. You can do it using the question. The diagram are just two rods with masses attached to them. I'm asking if moving in unison means moving with the same velocity.
 
master_333 said:
Furthermore the systems appear to rotate in unison as time progresses.
Sounds like the rotational velocity is the same.

master_333 said:
Do the systems have the same velocity?
Velocity of what? The masses? The center of mass? (See above.)
 
Thank you, that was very helpful.
 

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