College Physics

10th Edition

ISBN: 9781285737027

Author: Raymond A. Serway, Chris Vuille

Publisher: Cengage Learning

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In an old house, the heating system uses radiators, which are hollow metal devices through which hot water or steam circulates. In one room the ^{o}C. The new owner of the house paints the radiator a lighter color (emissitivity = 0.426). Assuming that it emits the same radiant power as it did before being painted, what is the temperature (in degrees Celsius) of the newly painted radiator?

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A metal rod is 10 cm long and has a diameter of 2 cm one end is in contact with steam at 100 deg C while the other end contacts a block of ice at 0 deg C. The cylindrical surface of the rod is carefully insulated so heat flows only from one end to end. In a time of 20 minutes, 320 grams of ice melts. What is the thermal conductivity of the metal?

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What is the rate of heat transfer by radiation, with an unclothed person standing in a dark room whose ambient temperature is 22.0ºC . The person has a normal skin temperature of 33.0ºC and a surface area of 1.50 m2 . The emissivity of skin is 0.97 in the infrared, where the radiation takes place.

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Group of answer choices
P2 = (A1/A2) (x1/x2) (k2/k1) P1
P2 = (A2/A1) (x1/x2) (k2/k1) P1
P2 = (A1/A2) (x2/x1) (k2/k1) P1
P2 = (A2/A1) (x2/x1) (k2/k1) P1
P2 = (A2/A1) (x1/x2) (k1/k2) P1

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22. In an old house, the heating system uses radiators, which are hollowmetal devices through which hot water or steam circulates. In one roomthe radiator has a dark color (emissivity 5 0.75). It has a temperatureof 62 8C. The new owner of the house paints the radiator a lighter color(emissivity 5 0.50). Assuming that it emits the same radiant power as itdid before being painted, what is the temperature (in degrees Celsius) ofthe newly painted radiator?

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