Consider a bird that flies at an average speed of 10.7 m / s and releases energy

Question

Consider a bird that flies at an average speed of 10.7m/s and releases energy from its body fat reserves at an average rate of 3.70W (this rate represents the power consumption of the bird). Assume that the bird consumes 4g of fat to fly over a distance db without stopping for feeding. How far will the bird fly before feeding again? Express your answer in kilometers. How many grams of carbohydrate mcarb would the bird have to consume to travel the same distance db? Express your answer in grams
Consider a bird that flies at an average speed of 10.7m/s and releases energy from its body fat reserves at an average rate of 3.70W (this rate represents the power consumption of the bird). Assume that the bird consumes 4g of fat to fly over a distance db without stopping for feeding. How far will the bird fly before feeding again? Express your answer in kilometers. How many grams of carbohydrate mcarb would the bird have to consume to travel the same distance db? Express your answer in grams
How many grams of carbohydrate mcarb would the bird have to consume to travel the same distance db? Express your answer in grams

Explanation / Answer

A. Time t = energy/power.
Distance = vt = 10.7*157393.6/3.7 = 455165.3 m. If this is realistic it's pretty amazing. But then, hummmingbirds are known to cross the Gulf of Mexico in a single ~800 km flight.
B. mcarb*4.2 cal/g = mfat*9.4 cal/g
mcarb = 4*9.4/4.2 = 8.95238 g

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