1 C a l = 4186 J . I gram of fat provides 9.4 calories I gram of carbohydrate pr

Question

1Cal=4186J.

I gram of fat provides 9.4 calories

I gram of carbohydrate provides 4.2 calories

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?

How many grams of carbohydrate mcarb would the bird have to consume to travel the same distance db?

Explanation / Answer

A) energy consumed by 4g = 4*9.4calories = 4*9.4*4.186 = 157.3936 J


time = energy / power = 157.3936/3.7 = 42.538 s

distance = v*t = 10.7*42.538 = 455.1566 m


B) mcarb = = 4*9.4 / 4.2 = 8.95 g

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