COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 15, Problem 12QAP
To determine
Why the room cannot be cool if the refrigerator door is kept open.
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Can you warm a kitchen in winter by leaving the ovendoor open? Can you cool the kitchen on a hot summerday by leaving the refrigerator door open? Explain.
#6. My buddy is starting to get hypothermic (body temperature 306 K) during an epic
backcountry ski adventure. Since I'm quite warm (body temperature 310 K), I decide to
get in a sleeping bag with him to try and warm him up. What heat transfer mechanism
will be most responsible for heating him up? For simplicity, ignore any internal temperature
differences across my body (that is, assume my skin temperature is also 310 K). Use num-
bers to support your answer (for human skin, you can use the following values: surface area
A = 1.50 m², emissivity € = 0.970, thickness d = 0.0250 m, thermal conductivty 0.200 ms.K)
J
#6. My buddy is starting to get hypothermic (body temperature 306 K) during an epic
backcountry ski adventure. Since I'm quite warm (body temperature 310 K), I decide to
get in a sleeping bag with him to try and warm him up. What heat transfer mechanism
will be most responsible for heating him up? For simplicity, ignore any internal temperature
differences across my body (that is, assume my skin temperature is also 310 K). Use num-
bers to support your answer (for human skin, you can use the following values: surface area
A = 1.50 m², emissivity = 0.970, thickness d= 0.0250 m, thermal conductivty 0.200 ms.K)
Chapter 15 Solutions
COLLEGE PHYSICS
Ch. 15 - Prob. 1QAPCh. 15 - Prob. 2QAPCh. 15 - Prob. 3QAPCh. 15 - Prob. 4QAPCh. 15 - Prob. 5QAPCh. 15 - Prob. 6QAPCh. 15 - Prob. 7QAPCh. 15 - Prob. 8QAPCh. 15 - Prob. 9QAPCh. 15 - Prob. 10QAP
Ch. 15 - Prob. 11QAPCh. 15 - Prob. 12QAPCh. 15 - Prob. 13QAPCh. 15 - Prob. 14QAPCh. 15 - Prob. 15QAPCh. 15 - Prob. 16QAPCh. 15 - Prob. 17QAPCh. 15 - Prob. 18QAPCh. 15 - Prob. 19QAPCh. 15 - Prob. 20QAPCh. 15 - Prob. 21QAPCh. 15 - Prob. 22QAPCh. 15 - Prob. 23QAPCh. 15 - Prob. 24QAPCh. 15 - Prob. 25QAPCh. 15 - Prob. 26QAPCh. 15 - Prob. 27QAPCh. 15 - Prob. 28QAPCh. 15 - Prob. 29QAPCh. 15 - Prob. 30QAPCh. 15 - Prob. 31QAPCh. 15 - Prob. 32QAPCh. 15 - Prob. 33QAPCh. 15 - Prob. 34QAPCh. 15 - Prob. 35QAPCh. 15 - Prob. 36QAPCh. 15 - Prob. 37QAPCh. 15 - Prob. 38QAPCh. 15 - Prob. 39QAPCh. 15 - Prob. 40QAPCh. 15 - Prob. 41QAPCh. 15 - Prob. 42QAPCh. 15 - Prob. 43QAPCh. 15 - Prob. 44QAPCh. 15 - Prob. 45QAPCh. 15 - Prob. 46QAPCh. 15 - Prob. 47QAPCh. 15 - Prob. 48QAPCh. 15 - Prob. 49QAPCh. 15 - Prob. 50QAPCh. 15 - Prob. 51QAPCh. 15 - Prob. 52QAPCh. 15 - Prob. 53QAPCh. 15 - Prob. 54QAPCh. 15 - Prob. 55QAPCh. 15 - Prob. 56QAPCh. 15 - Prob. 57QAPCh. 15 - Prob. 58QAPCh. 15 - Prob. 59QAPCh. 15 - Prob. 60QAPCh. 15 - Prob. 61QAPCh. 15 - Prob. 62QAPCh. 15 - Prob. 63QAPCh. 15 - Prob. 64QAPCh. 15 - Prob. 65QAPCh. 15 - Prob. 66QAPCh. 15 - Prob. 67QAPCh. 15 - Prob. 68QAPCh. 15 - Prob. 69QAPCh. 15 - Prob. 70QAPCh. 15 - Prob. 71QAPCh. 15 - Prob. 72QAPCh. 15 - Prob. 73QAPCh. 15 - Prob. 74QAPCh. 15 - Prob. 75QAPCh. 15 - Prob. 76QAPCh. 15 - Prob. 77QAPCh. 15 - Prob. 78QAPCh. 15 - Prob. 79QAPCh. 15 - Prob. 80QAPCh. 15 - Prob. 81QAPCh. 15 - Prob. 82QAPCh. 15 - Prob. 83QAPCh. 15 - Prob. 84QAPCh. 15 - Prob. 85QAPCh. 15 - Prob. 86QAPCh. 15 - Prob. 87QAPCh. 15 - Prob. 88QAPCh. 15 - Prob. 89QAPCh. 15 - Prob. 90QAPCh. 15 - Prob. 91QAPCh. 15 - Prob. 92QAPCh. 15 - Prob. 93QAPCh. 15 - Prob. 94QAPCh. 15 - Prob. 95QAPCh. 15 - Prob. 96QAPCh. 15 - Prob. 97QAPCh. 15 - Prob. 98QAPCh. 15 - Prob. 99QAPCh. 15 - Prob. 100QAP
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- A certain ideal gas has a molar specific heat of Cv = 72R. A 2.00-mol sample of the gas always starts at pressure 1.00 105 Pa and temperature 300 K. For each of the following processes, determine (a) the final pressure, (b) the final volume, (c) the final temperature, (d) the change in internal energy of the gas, (e) the energy added to the gas by heat, and (f) the work done on the gas. (i) The gas is heated at constant pressure to 400 K. (ii) The gas is heated at constant volume to 400 K. (iii) The gas is compressed at constant temperature to 1.20 105 Pa. (iv) The gas is compressed adiabatically to 1.20 105 Pa.arrow_forwardWhy is a person able to remove a piece of dry aluminum foil from a hot oven with bare fingers, whereas a burn results if there is moisture on the foil?arrow_forward#6. My buddy is starting to get hypothermic (body temperature 306 K) during an epic backcountry ski adventure. Since I'm quite warm (body temperature 310 K), I decide to get in a sleeping bag with him to try and warm him up. What heat transfer mechanism will be most responsible for heating him up? For simplicity, ignore any internal temperature differences across my body (that is, assume my skin temperature is also 310 K). Use num- bers to support your answer (for human skin, you can use the following values: surface area A = 1.50 m², emissivity e = 0.970, thickness d = 0.0250 m, thermal conductivty 0.200 ) m-s-Karrow_forward
- Your granny normally took a hot 2L hot water bottle (covered with a thin towel and at 50 degrees Celsius) with her to bed on a very cold winters night and it worked quite well. She however decided to replace the water bottle with a huge 2 kg piece of iron (also covered with a towel at 50 degrees Celsius). She only used the 2kg piece of iron for one day and decided to rather always use the hot water bottle throughout the cold winter. Use your knowledge of Physics to explain why granny only used the hot piece of iron for ONE day and went back to using the hot water bottle aferwards.arrow_forwardA 220-lb athlete drinks a glass of soda (125 calories) and walks up to the top of a Library Building. What is the change in his internal energy, assuming the only heat transfer is the 125 calories from the soda drink, and the only work done by the athlete is lifting his own weight to the 6th floor? Assume 3m per floor.arrow_forwardJim is cooking sopas (chicken noodle soup) for Noche Buena. He finished early in the afternoon and wants to preserve it but the sopas is still too hot if it will be put directly on the refrigerator. The sopas has just boiled a hundred degree Celsius and the refrigerator wasn't powerful enough for the big container of the soup if it was warmer than 20 degrees Celsius. Jose found out that cooling it in a sink full of cold water, while the faucet is running with the water resulting to roughly constant temperature of 3 degrees Celsius, could bring the temperature of the sopas to 58 degrees Celsius in 14 minutes. Determine the value of the proportionality constant.arrow_forward
- Can you cool your house by leaving the refrigerator door open?arrow_forwardCould you warm a kitchen by leaving the door of a hot oven open? Explain.arrow_forwardJim is cooking sopas (chicken noodle soup) for Noche Buena. He finished early in the afternoon and wants to preserve it but the sopas is still too hot if it will be put directly on the refrigerator. The sopas has just boiled a hundred degree Celsius and the refrigerator wasn't powerful enough for the big container of the soup if it was warmer than 20 degrees Celsius. Jose found out that cooling it in a sink full of cold water, while the faucet is running with the water resulting to roughly constant temperature of 5 degrees Celsius, could bring the temperature of the sopas to 60 degrees Celsius in 14 minutes. Determine the value of the proportionality constant. Note: SOLVE CONTINUOUSLY. Round off final answer to four decimal places. If your answer is -0.89665 then input -0.8967 as your answer. If your answer is -0.89664 then input-0.8966 as your answer.arrow_forward
- 1) Consider a tank containing 1 m³ of water at 20 °C. The tank is perfectly insulated. There are two copper rods, which each have one end in the water and the other in a reservoir at a different temperature. The first rod is 1 m long and 0.1 m in diameter, and its other end is in a reservoir of liquid nitrogen at 77 K. The second rod is 0.5 m long and 0.05 m in diameter, and its other end is connected to a reservoir at 120 °C. After some time the water in the tank freezes. What is the temperature of the ice in the tank when it finally reaches steady state? [kcu = 400 W m-¹ K-¹] a) 0 °C b) -20 °C c) - 50 °C d) - 70 °C e) - 90 °Carrow_forwardIt’s a hot day, and your apartment is rather warm. Your roommate suggests cooling off the apartment by keeping the door of the refrigerator open. Will this help the situation?arrow_forwardMc8arrow_forward
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