Human-powered aircraftrequire a pilot to pedal, as in a bicycle,and produce a su

Question

Human-powered aircraftrequire a pilot to

pedal, as in a bicycle,and produce a sustained power output of about 0.30 hp. TheGossamer

Albatrossflew across the English Channel on June12, 1979, in 2h 49 min. (a) Howmuch

energy did the pilotexpend during the flight? (b) How manySnickers candy bars (280 Cal

per bar) would the pilothave 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 conversionfactor between calories and joules is as follows:

1Cal = 1000 cal= 1 kcal = 4186J. ]

Explanation / Answer

the energy expended by the pilot is 0.30*10140hp

as the flight is for (2*60+49)*60

and 1hp is 746W so the energy expended by the humanis

2269332J   

b)this equals 2269332/4186=542.12 nutritional;calories

=542.12/280=1.936=2 candy bars

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