A few weeks ago we posted the puzzle on the right – well, here’s the answer.
A simple pendulum has a period given by
If you insert that into the expression in the puzzle you get
That simplifies to πg – which you could otherwise write as pi g!
This puzzle was originally posted in a quiz by I G Mansfield at edrith.co.uk – you might even like some of the other quizzes and games available there!