A ruler is exactly **L = 6** inches long.
It has a linear mass density
which increases from one end of the ruler to the other:

60 g/inch for the first inch 70 g/inch for the second inch 80 g/inch for the third inch 90 g/inch for the fourth inch 100 g/inch for the fifth inch 110 g/inch for the sixth inch

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 red box.

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

Copyright © Michael Richmond. This work is licensed under a Creative Commons License.