Unformatted text preview: for doing anything else, even eating! I understand that I need to provide my body with energy, however, and I have found a clever solution. I dismantled an extension cord and taped the two wires to my right ear and left big toe. I plug myself in for 5 hours during the evening, after which I feel refreshed and full of life. Normally, I eat 2400 Calories per day (which is actually 2400 kcal – see page 612). The energy I input by plugging myself in just matches this food intake. (a) If electricity costs 5.8 cents per kilowatthour, how much will my monthly electric bill increase assuming a 30day month? (b) If my logic is failed, and the input energy only goes into heating up my body, how much does my body temperature rise after one charging session. Assume that 30% of the input energy is lost to the surroundings during those 5 hours. Also, since the human body is about 70% water, you can use the C p of water. I weigh 73 kg....
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 Spring '08
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 Energy, Heat, Book problem

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