How much gravitational energy is released from the inspiral and merger of two 30-solar mass black holes?
How many more electrical power plants will the U.S. need if we all switch to driving electric cars?
Look for the answers online at tpt.aapt.org. Question suggestions are always welcome! For more Fermi questions and answers, see the now available Guesstimation 2.0: Solving Today's Problems on the Back of a Napkin, by Lawrence Weinstein (Princeton University Press, 2012).
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