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31 August, 20:38

Approximately 72 billion liters of milk are produced each year in the United States, from 8 million cows. On average, a single cow consumes 13500 kg of corn feed each year. it required 40 MJ to produce a kilogram of corn feed, which contains 20 MJ of energy. there are 15 MJ of energy in a single liter of milk. Calculate the energy efficiency of growing corn and converting it into milk.

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  1. 31 August, 21:50
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    0.25 or 25%

    Explanation:

    / represents divided by

    * represents multipled by

    a Milk in litres 72,000,000,000

    b Number of cows 8,000,000

    c Milk per cow (litres) 9,000 (a/b)

    To calculate how much milk per cow is being produced, you can divide total amount of milk by the number of cows

    d Energy Produced Per 1 liter of milk (MJ) 15

    e Energy Produced by Each cow (MJ) 135,000 (c*d)

    Since we know how much energy is produced by 1 liter of milk, we can calculate total energy produced by a cow on average by multiplying the d and e

    f Per cow consumption of corn feed (Kg) 13,500

    g Energy used to make 1kg of corn feed (MJ) 40

    h Energy consumed by each cow (MJ) 540,000 (f*g)

    Since a cow consumes 13500 kg of corn and one kg of corn uses 40MJ of energy, we how much effective energy is consumed by the cow

    i Energy Efficiency 0.25 or 25% (e/h)

    Since the cow consumed 540,000 MJ to produce 135,000 MJ of energy, we know the energy efficiency is 135,000 divided by 540,000, the efficiency stands at 25%.
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