P221_2008_week7 - Chapter 7 problems Chapter 7...

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Chapter 7 problems
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Chapter 7 problems (42 (3 votes), 57 (2votes))
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Chapter 7 problems (42 (3 votes), 57 (2votes))
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Chapter 8 Problems (cont.) (36 (5 votes), 53 (3 votes))
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Chapter 8 Problems (cont.)
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The book gives a mathematical expression for the coordinates (X,Y,Z) of the center of mass (CoM) of a collection of particles. Someone has suggested that these formulas amount to stating that the CoM is the mass-weighted average position of the collection of particles. Comment briefly on the validity/universality of this statement. (13 Yes; 9 No; 6 didn’t understand or gave confusing answers; 15 no answer) I don't think it's valid, because formula doesn't exactly give us the mass-weighted average position. You know, unless I'm understanding the question incorrectly. It is worded somewhat strangely. If by that statement the person means the relative mass weights the position, I would consider that valid universal as it basically just restates the formula. The word average makes me hesitant because that usually implies
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