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16 June, 13:41

A slice of bread contains about 100 kcal. If specific heat of a person were 1.00 kcal/kg·°C, by how many °C would the temperature of a 70.0-kg person increase if all the energy in the bread were converted to heat? a. 2.25°Cb. 1.86°Cc. 1.43°Cd. 1.00°C

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  1. 16 June, 13:54
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    (c) 1.43°C

    Explanation:

    If the energy in the bread are converted to heat.

    Then, The heat transferred from the bread to person = 100 kcal.

    From specific heat capacity,

    Q = cmΔT ... equation 1

    Where Q = quantity of heat, m = mass of the person, c = specific heat capacity of the person, Δ = increase in temperature.

    Making ΔT the subject the equation 1,

    ΔT = Q/cm ... equation 2

    Where Q = 100 kcal, c = 1.00 kcal/kg.°C, m = 70.0 kg

    Substituting these values into equation 2,

    ΔT = 100 / (1*70)

    ΔT = 100/70

    ΔT = 1.428

    ΔT ≈ 1.43°C

    The increase in temperature of the body is = 1.43°C

    The right option is (c) 1.43°C
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