A ruler is exactly 6 inches long. It has a linear mass density of 60 grams per inch; that means that a piece of the ruler 1 inch long has a mass of 60 grams.

Q: What is the mass of one inch of the ruler? Q: What is the total mass of this ruler?

Now, let's consider one little piece of this ruler: I'll mark it with a dark blue color.

Q: What is the mass of this little piece? Q: What is the contribution of this little piece to the equation for center of mass? Q: What is the location of the center of mass of the ruler in the horizontal direction?The answers

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