Stack of Pennies

There are four stacks of pennies lined up in a row. The first stack has 4 pennies, the second stack 5 pennies, the third stack 6 pennies, and the last stack 7 pennies. All pennies have mass \(m\) and diameter \(d\).

Question Text

How far to the right of the centre of the first stack is the centre of mass of this collection of pennies? Give your answer in terms of \(d\). Don’t worry about the vertical position of the centre of mass, just give the horizontal position.

Answer Section

Please enter in a numeric value in terms of \(d\) (if your answer is 50\(d\), then just enter 50 in the box).

Attribution

Problem is licensed under the CC-BY-NC-SA 4.0 license.