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 0.302 hp. The Gossamer Albatross flew across the English Channel on June 12, 1979 in 2 h 49 min.
(a) How much energy would the pilot expend on a flight lasting 155 min?
MJ

(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, 1 Cal, 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.]
Snickers

Explanation / Answer

a.energy=power*time=0.303*746*170*60=2.3*10^6 J b.energy per bar=280*4186=1.17*10^6 J so candy bar required=2.3*10^6/(1.7*10^6)=1.352 so rounding off the result,he should take 2 candy bars

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