Brainteaser posters aim to get people thinking about physics
One for example asks: “Two filled cola cans, one frozen, one liquid, roll down a short smooth slope – which one gets to the bottom first?”
Ooh, ooh, ooh! I know this one!
The questions are engaging but you have to think before answering. “Most of the questions do surprise,” she said, for example: “A clock on the equator runs slower, faster or identical to one on the North Pole?”
All the Q&A are here; there is a link to a document file for the answers down at the bottom.
Physics Today 58(3) 34 (2005)
Time passage, equator vs. poles
http://www.newtonphysics.on.ca/faq/relativity_gps_10.html
Longitudinal and transverse mass