Calculating Velocity of Center of Mass: Exploring an Example with Given Masses

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Discussion Overview

The discussion revolves around the calculation of the velocity of the center of mass in a scenario involving a car and a truck, where specific mass values are not provided in the current example. Participants explore the implications of this absence and consider alternative methods for determining the center of mass velocity.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant questions how the velocity of the center of mass can be determined without given mass values, suggesting a need for alternative methods.
  • Another participant notes that the lecturer defined the velocity of the center of mass as 4 m/s, implying that the mass ratio might be established later.
  • A participant acknowledges the initial question and expresses gratitude for the discussion.
  • One participant reiterates the question about the absence of mass values and suggests that the lecturer is likely reviewing a calculation from a previous lecture.
  • Another participant confirms that the lecturer refers to a prior example where the masses were presumably provided.

Areas of Agreement / Disagreement

Participants express uncertainty regarding the absence of mass values and whether alternative methods exist for calculating the center of mass velocity. There is no consensus on how to approach the problem or the implications of the lecturer's example.

Contextual Notes

The discussion highlights the potential limitations of the example due to missing mass values and the reliance on previous lectures for context. The exact definitions and assumptions regarding mass ratios remain unspecified.

gracy
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But in this lecture

First example of car and truck no mass is given but he has solved for velocity of centre of mass.
How?Is there any other alternative way to solve for velocity of centre of mass.
 
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He just defined it to be 4m/s (it is his example, he can do that), where the masses or at least the ratio of the masses have to be determined later.
 
Oh! thanks.
 
gracy said:
First example of car and truck no mass is given but he has solved for velocity of centre of mass.
How?Is there any other alternative way to solve for velocity of centre of mass.
Looks to me like he's referring to a calculation done in a previous lecture. He's just reviewing the calculation, not doing it here.
 
He is referring explicitly (around 4:20) to an example discussed previously. So the masses were given, I suppose.
 

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