Homework Answers
Energy required in 1 year = energy in 1 month * number of month in 1 year
= 1500 kwh * 12
= 18000 kwh
= 18000 * 1000 * 3600 J
= 6.48*10^10 J
Now use:
E = m*c^2
6.48*10^10 J = m * (3.0*10^8)^2
m = 7.2*10^-7 Kg
m = 7.2*10^-4 g
Answer: 7.2*10^-4 g/year
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