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March 24, 2017

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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.

  • Math - ,

    So from what i understand i have done this but im not sure if this is correct could you please tell me what you think! thank you so much for your help =)!


    20000lbs is about 9090kg.

    Energy used in transport = 0.76 * 3700 * 9090 = 2.56E7 kcal

    Energy in the food = 170 * 9090 = 1545300

    Ratio = 2.56E7/1.55E6 = 16.5

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