Multiple-Concept Example 8 reviews the approach that is used in problems such as this. A person eats a dessert that contains 240Calories. (This "Calorie" unit, with a capital C, is the one used by nutritionists; 1 Calorie = 4186 J. See Section 12.7.) The skintemperature of the person is 38 °C and that of her environment is 18 °C. The emissivity of her skin is 0.68 and its surface area is 1.3 m².How many hours would it take her to emit a net radiant energy from her body that is equal to the energy contained in this dessert?Heat fromenvironmentNumberUnitsHeat frompersonΤοT

We know, from Stephan's- Boltzman law P=tQ=eσA(T4−T04)Where σ=5.67×10−8W/m2K4....Stephan's…

Answered: Multiple-Concept Example 8 reviews the…

College Physics

10th Edition

ISBN:9781285737027

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter11: Energy In Thermal Processes

Section: Chapter Questions

Problem 54AP: The surface area of an unclothed person is 1.50 m2, and his skin temperature is 33.0C. The person is...

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The surface area of an unclothed person is 1.50 m2, and his skin temperature is 33.0C. The person is located in a dark room with a temperature of 20.0C, and the emissivity of the skin is e = 0.95. (a) At what rate is energy radiated by the body? (b) What is the significance of the sign of your answer?
A person eats a dessert that contains 250 Calories. (This "Calorie" unit,with a capital C, is the one used by nutritionists; 1 Calorie = 4186 J.) The skintemperature of this individual is 36°C and that of her environment is 22° C. The emissivity of her skin is 0.75 and its surface area is 1.3 m2. How much time would it take for her to emit a net radiant energy from her body that is equal to the energy contained in this dessert?
A person eats a dessert that contains 170 Calories. (This "Calorie" unit, with a capital C, is the one used by nutritionists; 1 Calorie = 4186 J. See Section 12.7.) The skin temperature of the person is 36 °C and that of her environment is 18 °C. The emissivity of her skin is 0.71 and its surface area is 1.5 m2. How many hours would it take her to emit a net radiant energy from her body that is equal to the energy contained in this dessert?
A student is trying to decide what to wear. His bedroom is at 20.0°C. His skin temperature is 35.0°C. The area of his exposed skin is 1.50 m2. People all over the world have skin that is dark in the infrared, with emissivity about 0.900.Find the net energy transfer from his body by radiation in 10.0 min.
A concerned mother is dressing her child for play in the snow. The child’s skin temperature is 34.0°C and the outside air temperature is1.5°C. If the emissivity of the child’s skin is 0.710 and he has 0.0115 m2 of exposed skin area, what is the amount of energy transferred from his body to the surroundings in 1.00 h?
Questions 13 through 14 pertain to the situation described below: A 73.0-kg man is in an environment of –10.0°C. The temperature, area, and emissivity of his skin are 33.0°C, 1.73 m², and 0.820, respectively. Assume that his metabolic energy production is 211 J/s and his specific heat is 3.50 × 10³ J/(kg K). (13) What is the net emission power of his body? (A) 341 W; (B) 321 W; (C) 301 W; (D) 281 W; (E) 261 W. (14) What is the rate of his body temperature drop? (A) 2.39°F/hr; (B) 2.59°F/hr; (C) 2.79°F/hr; (D) 2.99°F/hr; (E) 3.19°F/hr.
The amount of heat per second conducted from the blood capillaries beneath the skin to the surface is 260 J/s. The energy is transferred a distance of 1.5 x 103 m through a body whose surface area is 1.4 m². Assuming that the thermal conductivity is that of body fat, determine the temperature difference between the capillaries and the surface of the skin.
A concerned mother is dressing her child for play in the snow. The child’s skin temperature is 34.0 Celsius, and the outside air temperature is 1.5 Celsius. If the emissivity of the child’s skin is 0.710 and has 1.15E-2 m^2 of exposed skin area, what is the amount of energy transferred from his body to the surroundings in 1.00 hr?
A glass windowpane in a home is 0.0058 m thick and has dimensions of 1.1 m x 2.3 m. On a certain day, the indoor temperature is 22°C and the outdoor temperature is 0°C (Thermal conductivity for glass is 0.840 J/s-m-°C.) (a) 7020 J/s (b) 3510 J/s (c) 4180 J/s (d) 8061 J/s
A concerned mother is dressing her child for play in the snow. The child's skin temperature is 35.0°C, and the outside air temperature is 1.25°C. If the emissivity of the child's skin is 0.770 and he has 1.25 x 10-2 m² of exposed skin area, what is the amount of energy transferred from his body to the surroundings in 1.00 h? 6347.5177 X J
You have a mystery substance, length 2.0 m, cross section 0.40 m2 , and apply atemperature difference of 69°C across its length. If the substance conducts 1000.0 J ofheat in 0.50 sec, what is its thermal conductivity?
An orange orb has a surface area of 6.1 m2 and its surroundings are at 216°C. The orange orb is absorbing heat via radiation at a rate of 510 W and it is emitting heat via radiation at a rate of 661 W. Determine the emissivity of the orb, the temperature of the orb, & Pnet.

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