a) Assuming your skin temperature is 97.2 °F and the temperature of your surroundings is 60.0 °F, determine the length of time in minutes required for you to radiate away the energy gained by eating a 430 kJ apple. Let the emissivity of your skin be 0.9 and its area be 1.22 m². [Answer in 2 significant figures]
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![a)
Assuming your skin temperature is 97.2 °F and the temperature of your
surroundings is 60.0 °F, determine the length of time in minutes required for you to radiate away
the energy gained by eating a 430 kJ apple. Let the emissivity of your skin be 0.9 and its area be
1.22 m². [Answer in 2 significant figures]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fd4f4bcf4-ad25-4b85-b0fc-84a2a5d163bb%2F42c24292-537a-4ef0-9c03-06d1faaf1336%2Fujty341_processed.png&w=3840&q=75)
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- An electric stove burner has surface area 325 cm² and emissivity e = 1. The burner consumes 1500 W and is at 900 K. If room temperature is 300 K, what fraction of the burner's heat loss is from radiation?The surface of the Sun has a temperature of about 5 800 K. The radius of the Sun is 6.96 × 108 m. Calculate the total energy radiated by the Sun each second. Assume that the emissivity is 0.986.As a rough approximation, the human body may be considered to be a cylinder of length L=2.0m and circumference C=0.8m. (To simplify things, ignore the circular top and bottom of the cylinder, and just consider the cylindrical sides.) If the emissivity of skin is taken to be e=0.6, and the surface temperature is taken to be T=30∘C, how much thermal power P does the human body radiate?
- 6. Go The block in the drawing has dimensions L, × 2L, × 3L, where L, = 0.30 m. The block has a thermal conductivity of 250 J/(s •m · C°). In drawings A, B, and C, heat is conducted through the block in three different directions; in each case the temperature of the warmer surface is 35 °C and that of the cooler surface is 19 °C. Determine the heat that flows in 5.0 s for each case. Lo 2L0 3Lo B AThe surface area of an unclothed person is 1.55 m2, and his skin temperature is 33.0°C. The person is located in a dark room with a temperature of 17.0°C, and the emissivity of the skin is e = 0.95. (Include the sign of the value in your answer.) (a) At what rate is energy radiated by the body?W(b) What is the significance of the sign of your answer?Suppose that you intercept 5.0 * 10-3 of the energy radiated by a hot sphere that has a radius of 0.020 m, an emissivity of 0.80, and a surface temperature of 500 K. How much energy do you intercept in 2.0 min?