4.30) The useful power output of Bryan Allen, who flew a human-powered airplane across the English Channel on June 12, 1979, was about 350 W. The propeller of the airplane was driven by the pilot's legs, using a bicycle-type drive mechanism. Using the efficiency for legs given in Table 4.3, calculate the food energy he needed for the 2.5 hour trip. (The efficiency according in the Table 4.3 for legs in cycling is 20%)
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