A runner generates 1260 W of thermal energy. If this heat has to be removed by evaporation, how much water does this runner lose in 15 minutes of running? The latent heat of vaporization of water is 22.6 × 10⁵ J/kg.

Question

Quizplus · Accepted Answer

The total energy generated in 15 minutes is 1260 W * 900 s = 1134000 J. Using the latent heat of vaporization, the mass of water lost is 1134000 J / (22.6 × 10^5 J/kg) = 0.0502 kg, which is approximately 50 g.

A Runner Generates 1260 W of Thermal Energy