Question and answer
Truck transportation has an energy cost of 0.76 kcal kg-1 km-1, and it is about 3700 km from San Francisco to Toronto. If a romaine lettuce grown near SF has a specific energy content of 17.0 kcal (100g)-1 and the diesel-powered truck has a payload of 20,000 lbs, calculate the ratio of the amount of energy spent in transportation to the amount of energy delivered in the product.
oh boy, i need some time to calculate this.
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Asked 11/6/2008 10:30:53 AM
Updated 6/12/2023 11:44:13 AM
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Solution:
Energy spent = 0.76 kcal kg^(-1) km^(-1) * 9071.85 kg * 3700 km
Energy spent = 2529641.46 kcal

Energy content = 17.0 kcal (100g)^(-1) * (1 kg / 1000 g)
Energy content = 0.17 kcal kg^(-1)

Ratio = 2529641.46 kcal / (0.17 kcal kg^(-1) * 9071.85 kg)
Ratio 16.69

Therefore, the ratio of the amount of energy spent in transportation to the amount of energy delivered in the product is approximately 16.69.
Added 6/12/2023 11:44:13 AM
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