How many mosquitoes would it take to drain a person of blood? (Thanks to Stephanie Hayes, Dane Schoelen, and Emily Vittitow from my Oklahoma Scholar-Leadership Enrichment Program (OSLEP) class for suggesting the question.)

What is the rope-tension in a tug of war contest? How much energy is stored in the rope? (Thanks to Bob Friedhoffer of for suggesting the question.)

Look for the answers online at 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.