A long rod, insulated to prevent heat loss along its sides, is in perfect thermal contact with boiling water (at atmospheric pressure) at one end and with an ice- water mixture at the other (Eigure 1). The rod consists of a 1.00 m section of copper (with one end in the boiling water) joined end-to-end to a length ₂ of steel (with one end in the ice water). Both sections of the rod have cross-sectional areas of 4.00 cm². The temperature of the copper-steel junction is 65.0°C after a steady state has been reached. Assume that the thermal conductivities of copper W and steel are given by copper = 385 and kistel = 50.2 mK mk Figure Coiling 65.0°C COPPER STEEL -1.00 m-L2- 0000 and water 1 of 1 > Part A How much heat per second (=) flows from the boiling water to the ice-water mixture? Express your answer in watts. ▸ View Available Hint(s) H = 5.39 W ✔ Correct Because the system is assumed to have reached a steady state, the heat flowing out of the boiling water must be equal to the heat flowing through the copper section of the rod. Part B Previous Answers What is the length of the steel section? Express your answer in meters. ▸ View Available Hint(s) Submit Η ΑΣΦΑ L₂-0.19 Previous Answers C X Incorrect; Try Again; 4 attempts remaining ?
A long rod, insulated to prevent heat loss along its sides, is in perfect thermal contact with boiling water (at atmospheric pressure) at one end and with an ice- water mixture at the other (Eigure 1). The rod consists of a 1.00 m section of copper (with one end in the boiling water) joined end-to-end to a length ₂ of steel (with one end in the ice water). Both sections of the rod have cross-sectional areas of 4.00 cm². The temperature of the copper-steel junction is 65.0°C after a steady state has been reached. Assume that the thermal conductivities of copper W and steel are given by copper = 385 and kistel = 50.2 mK mk Figure Coiling 65.0°C COPPER STEEL -1.00 m-L2- 0000 and water 1 of 1 > Part A How much heat per second (=) flows from the boiling water to the ice-water mixture? Express your answer in watts. ▸ View Available Hint(s) H = 5.39 W ✔ Correct Because the system is assumed to have reached a steady state, the heat flowing out of the boiling water must be equal to the heat flowing through the copper section of the rod. Part B Previous Answers What is the length of the steel section? Express your answer in meters. ▸ View Available Hint(s) Submit Η ΑΣΦΑ L₂-0.19 Previous Answers C X Incorrect; Try Again; 4 attempts remaining ?
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 40P: The thermal conductivities of human tissues vary greatly. Fat and skin have conductivities of about...
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Transcribed Image Text:A long rod, insulated to prevent heat loss along its sides, is in perfect thermal
contact with boiling water (at atmospheric pressure) at one end and with an ice-
water mixture at the other (Figure 1). The rod consists of a 1.00 m section of
copper (with one end in the boiling water) joined end-to-end to a length 1₂ of
steel (with one end in the ice water). Both sections of the rod have cross-sectional
areas of 4.00 cm². The temperature of the copper-steel junction is 65.0°C after a
steady state has been reached. Assume that the thermal conductivities of copper
W
W
and steel are given by copper = 385
mrk and steel = 50.2
m-K
Figure
Boiling
water
200 00
65.0°C
COPPER STEEL
-1.00 mL200
1800
Ice and
water
1 of 1
Part A
How much heat per second H (=
Express your answer in watts.
► View Available Hint(s)
H= 5.39 W
Submit
Part B
Previous Answers
Correct
Because the system is assumed to have reached a steady state, the heat flowing out of the boiling water must be equal to the heat flowing through the copper section of the rod.
What is the length I of the steel section?
Express your answer in meters.
► View Available Hint(s)
ΠΙ ΑΣΦ
2)
) flows from the boiling water to the ice-water mixture?
L₂= 0.19
Submit Previous Answers
X Incorrect; Try Again; 4 attempts remaining
?
m
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