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18 February, 05:23

On his honeymoon, James Joule attempted to explore the relationships between various forms of energy by measuring the rise of temperature of water which had fallen down a waterfall on Mount Blanc.

What maximum temperature rise would one expect for a waterfall with a vertical drop of 20 m? The specific heat of water is 4186 J/kg ∙ain K. 32)

A) 0.071 C° B) 0.053C° C) 0.047 C° D) 0.064 C°

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  1. 18 February, 07:10
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    The maximum temperature rise = 0.047 °C

    Explanation:

    Potential Energy, P = mgh

    Energy transfered, Q=mcΔT

    Potential energy = Energy transfered

    mgh = mcΔT

    gh = cΔT

    ΔT = gh/c

    ΔT = (9.81 * 20) / 4186

    ΔT = 0.047 °C
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