Principles of Physics 11th ISV Edition · Temperature, Heat, and the First Law of Thermodynamics · Problem 34
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Walker, Halliday & Resnick — Temperature, Heat, and the First Law of Thermodynamics: Problem 34
34 The giant hornet Vespa mandarinia japonica preys on Japanese bees. However, if one of the hornets attempts to invade a beehive, several hundred of the bees quickly form a compact ball around the hornet to stop it. They don’t sting, bite, crush, or suffocate it. Rather they overheat it by quickly raising their body temperatures from the normal 35°C to 47°C or 48°C, which is lethal to the hornet but not to the bees (Fig. 18-36). Assume the following: 500 bees form a ball of radius R = 1.8 cm for a time t = 18 min, the primary loss of energy by the ball is by thermal radiation, the ball’s surface has emissivity ε = 0.80, and the ball has a uniform temperature. On average, how much additional energy must each bee produce during the 18 min to maintain 47°C?
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주어진 조건: 35°C, 47°C, 48°C, 1.8 cm
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Principles of Physics · 11th ISV Edition
저자: Walker, Halliday & Resnick
출판사: Wiley
단원: Temperature, Heat, and the First Law of Thermodynamics