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How many pennies does it take to tile the floor of a room? How much does that cost? (Thanks to Delaney Wright, Olivia Reel, and Halina Garraway of my Oklahoma Scholar-Leadership Enrichment Program (OSLEP) class for suggesting the question.)
How dangerous is secondhand smoke? (Thanks to Olivia Reel from my Oklahoma Scholar-Leadership Enrichment Program (OSLEP) class for suggesting the question.)
Look for the answers next month online at tpt.aapt.org. Question suggestions are always welcome! For more Fermi questions and answers, see Guesstimation 2.0: Solving Today’s Problems on the Back of a Napkin, by Lawrence Weinstein (Princeton University Press, 2012).
AAPT members receive access to The Physics Teacher and the American Journal of Physics as a member benefit. To learn more about this member benefit and becoming an AAPT member, visit the Joining AAPT page.