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March 27, 2017

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The box of a well-known breakfast cereal states that one ounce of the cereal contains 129 Calories (1 food Calorie = 4186 J). If 2.55% of this energy could be converted by a weight lifter's body into work done in lifting a barbell, what is the weight of the heaviest barbell that could be lifted a distance of 1.91 m?

  • Physics - ,

    129 Cal * 4186 J/Cal = 536,124 Joules

    .0255 * 536,124 = 13,671 Joules

    m g h = m g (1.91) = 13,671

    so

    m g = 7158 Newtons weight

    and
    m = 730 Kilograms of mass

    around 1600 pounds

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