(a) A particular household uses a 1.8-kW heater 3.0 h/day
Chapter 16, Problem 62GP(choose chapter or problem)
(a) A particular household uses a \(1.8-\mathrm{kW}\) heater \(3.0 \mathrm{~h} /\) day ("on" time), four \(100-\mathrm{W}\) lightbulbs \(6.0 \mathrm{~h} /\) day, a \(3.0-\mathrm{kW}\) electric stove element for a total of \(1.4 \mathrm{~h} /\) day, and miscellaneous power amounting to \(2.0 \mathrm{kWh} /\) day. If electricity costs $0.105 per \(\mathrm{kWh}\), what will be their monthly bill \((30 \mathrm{~d})\)?
(b) How much coal (which produces \(7000 \mathrm{kcal} / \mathrm{kg}\) ) must be burned by a 35%-efficient power plant to provide the yearly needs of this household?
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