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

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Similar questions

Provide the solution to the problem. The answer is provided already. The height of the Washington Monument is measured to be 170 m on a day when the temperature is 35.0C. What will its height be on a day when the temperature falls to -10.0C? Although the monument is made of limestone, assume that its thermal coefficient of expansion is the same as marble's. Answer: 169.98 m
Presents the diagram of the problem, necessary formulas, clearance and numerical solution: The filament of an incandescent lamp has an area of 50 mm2 and operates at a temperature of 2,127 ◦C. Assume that all the energy supplied to the bulb is radiated by it. If the emissivity of the filament is 0.83, how much power must be supplied to the bulb when it is in operation?
A lab instructor performs an experiment using an aluminum cup that contains 225 g of water and a 130 g copper stirrer, all initially at 27.0°C. (Note that the student wears insulated gloves when handling the stirrer.) The lab instructor then adds a sample of silver to the water. The sample has a mass of 446 g and is initially at a temperature of 85.0*C. After stirring the mixture until it reaches thermal equilibrium, the lab instructor measures a final temperature of 32.0°C. What is the mass (in g) of the aluminum cup? Need Help? Read
A bubble having a diameter of 62 cm is re- leased from a depth of 4.6 m from the bottom of a swimming pool. The temperature of the water at the surface is 21°C, whereas it is 15°C at the point of release. What will the diameter of the bubble be when it reaches the surface? The acceleration of gravity is 9.8 m/s² and the density of water is 1000 kg/m³. Answer in units of cm.
In everyday experience, the measures of temperature most often used are Fahrenheit F and Celsius C. Recall that the relationship between them is given by the following formula. F = 1.8C + 32 Physicists and chemists often use the Kelvin temperature scale. You can get kelvins K from degrees Celsius by using the following formula. K = C + 273.15 (a) Calculate that value.K(25) = (b) Find a formula expressing the temperature C in degrees Celsius as a function of the temperature K in kelvins. C = (c) Find a formula expressing the temperature F in degrees Fahrenheit as a function of the temperature K in kelvins. F = (d) What is the temperature in degrees Fahrenheit of an object that is 272 kelvins?
A wood stove is used to heat a single room. The stove is cylindrical in shape, with a diameter of 40.0 cm and a length of 55.0 cm, and operates at a temperature of 410°F. (o = 5.6696 x 108 w/m2 . K, 1 Btu = 1054 J.) (a) If the temperature of the room is 70.0°F, determine the amount of radiant energy delivered to the room by the stove each second if the emissivity is 0.950. (b) If the room is a square with walls that are 8.00 ft high and 30.0 ft wide, determine the R-value needed in the walls and ceiling to maintain the inside temperature at 70.0°F if the outside temperature is 32.0°F. Note that we are ignoring any heat conveyed by the stove via convection and any energy lost through the walls (and windows!) via convection or radiation. ft2. oF . h/Btu
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?
A student is trying to decide what to wear. His bedroom is at 20°C. His skin temperature is 35°C. The area of his exposed skin is 1.50 m². People of all races have skin that is dark in the infrared, with emissivity about 0.900. Find the net energy loss from his body by radiation in 10.0 min.
J Problem 8.10*. (a) For the human body, what is the rate of heat transfer by conduction through the body's tissue k = 0.200m.K with the following conditions: the tissue thickness is 3.00 cm, the change in temperature is 2.00°C, and the skin area is 1.50 m². [20.0 W] (b) What fraction of your daily caloric intake goes into warming your body in this situation? [20.7%]

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