You have a ruler and $10$ pennies again. You place three pennies on the ruler at the $1in.cm$ mark and seven pennies on the ruler at the $8$ in$.(20cm)$ mark. Without picking up the ruler, can you determine where its center of gravity is$?$

Answer rating: 100% (QA)

Yes The center of gravity of the ruler with the pennies attached can be determined without picking u... View the full answer