Human-powered aircraft require a pilot to pedal, as in a bicycle, and produce a

Question

Human-powered aircraft require a pilot to pedal, as in a bicycle, and produce a
sustained power output of about 0.30 hp. The Gossamer Albatross flew across the English
Channel on June 12, 1979, in 2h 49 min. (a) How much energy did the pilot expend during
the flight? (b) How many Snickers candy bars (280 Cal per bar) would the pilot have to
consume to be “fueled up” for the flight? [Note: The nutritional calorie, 1Cal, is equivalent to
1000 calories (1000 cal) as defined in physics. In addition, the conversion factor between
calories and joules is as follows: 1 Cal = 1000 cal = 1 kcal = 4186 J. ]

Explanation / Answer

a)power =E/t 0.3*746 W =E/(169*60) E =2269332 J b) nnumber of snickers candy n =E/(280*4186) =2269332/280*4186 =1.936 number os snickers required =2

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