Solar panels on one of the NWU solar car prototype, have an emissivity of e = 0.819.  When in direct sunlight, they absorb energy at a rate of 877 J/s per square meter of surface.  Assume that the only energy loss is due to the emission of radiation.  What equilibrium temperature are the panels reaching?

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The rate at which a resting person converts food energy is called one’s basal metabolic rate (BMR). Assume that the resulting internal energy leaves a person’s body by radiation and convection of dry air. When you jog, most of the food energy you burn above your BMR becomes internalenergy that would raise your body temperature if it were not eliminated. Assume that evaporation of perspiration is the mechanism for eliminating this energy. Suppose a person is jogging for “maximum fat burning,” converting food energy at the rate 400 kcal/h above his BMR, and putting out energy by work at the rate 60.0 W. Assume that the heat of evaporation of water at body temperature is equal to its heat of vaporization at 100°C. (a) Determine the hourly rate at which water must evaporate from his skin. (b) When you metabolize fat, the hydrogen atoms in the fat molecule are transferred to oxygen to form water. Assume that metabolism of 1.00 g of fat generates 9.00 kcal of energy and produces 1.00 g of…

1. Thermography is a technique for measuring radiant heat and detecting variations in surface temperatures that may be medically, environmentally, or militarily meaningful. (a) What is the percent increase in the rate of heat transfer by radiation from a given area at a temperature of 34.3 deg C compared with that at 33.5 deg C, such as on a person's skin? % Increase = % (b) What is the percent increase in the rate of heat transfer by radiation from a given area at a temperature of 34 deg C compared with that at 20.3 deg C, such as for warm and cool automobile hoods? % Increase= %