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This is Einstein's famous Mass-Energy Equivalence formula. It's almost certain that you've seen it, less certain that you fully comprehend it, or, even, truly believe it.
And almost certainly you've never worked with it and put numbers into it to see what comes out. The units may be slightly unfamiliar but easy to relate to. A kilogram is about 2.2 pounds, a meter per second is a bit more than a yard or three feet per second.
What's a Joule?
That's familiar too, under a different name, the kilowatt-hour, or kWh. Since the Joule is a Watt-second, a kWh is simply 1,000 Watts times 3600 seconds, or 3,600,000 Joules.
In Arizona, according to Mr. Internet, your house uses an average 35kWh per day, or 86 million Joules |