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**1. Homework Statement**

The annual energy requirement of the USA is of the order [tex]10^20[/tex] J. If we could find a 100% efficient process that could change matter into energy, how many kilograms of material would be needed to meet this requirement?

**2. Homework Equations**

[tex]E = mc^2[/tex]

**3. The Attempt at a Solution**

Well, i simply sub [tex]10^2^0[/tex] in to [tex]E = mc^2[/tex]

And i obtain, [tex]\frac{10^2^0}{(3.0*10^8)^2}[/tex]

then [tex]m=11,111.1111[/tex]

Is this correct? It looks to me like too simple a question, since this is the last question of my tutorial.

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