Postby **hmcginny** » March 31st, 2012, 10:46 pm

very early on Angstrom asked a question that no one answered: "How much energy is lost to sound in a flight from NY to LA?", and at the time I had no idea how to answer it and it had been bugging me for a while, but in studying for sounds I found the amount of sound energy in watts released by certain instruments. A full orchestra releases 67 watts, and planes are louder than that, but not 10 times as loud, so E2 watts. That flight would take around 6 hours, so thats 2E4 seconds, or 2E6 Joules of energy released.

The average lightbulb is like E2 watts, there are E8 households in the US, each with E1 lightbulbs on for 5 hours or so that we would consider "night". So thats E11 watts from lightbulbs times the ~2E4 seconds that they are on for, giving us E15 joules released.

How many fermi questions are there? Well, each team in science olympiad has probably written at least E2 in the years that this has been an event. Some probably haven't written any, so that outweighs those of us that have written E3, so lets say olympiad alone has led to E5 questions. All of the order of magnitude classes at colleges are a whole bunch more, so lets say there are probably E7 fermi questions ever written.

If an asteroid hits the earth and 10% of its mass is evenly distributed across the earth at a rate of .2 Tg/Pm^2 (Teragrams per petameter squared), how massive was the original asteroid in kg? I'll give you a hint, the asteroid is not a normal mass.

Harriton 2013 (Captain 2012-2013)

Penn 2017

2014 PA State Compound Machines Supervisor

Past Events: Fermi, Thermo, WIDI, Maglev, TPS, Chem Lab, Mission, Sounds, Trajectory, Mousetrap, etc.