Assume that a typical city consumes electrical energy at a rate of 2.0 × 10^-9 W.How many kilograms of matter would have to be converted entirely into energy in order to keep this city running for 21 weeks? A)0.28 kg B)0.32 kg C)0.40 kg D)0.48 kg

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Using E=mc², where E is energy, m is mass, and c is the speed of light (3×10⁸ m/s), calculate the energy needed for 21 weeks and convert it to mass. The energy consumed is 2.0×10⁻⁹ W × 21 weeks × 7 days/week × 24 hours/day × 3600 seconds/hour. Solving for mass gives approximately 0.28 kg.

Assume That a Typical City Consumes Electrical Energy at a Rate