A spherical shell has inner radius 3.00 cm and outer radius 7.00 cm. It is made of material with thermal conductivity k = 0.800 W/m - °C. The interior is maintained at tempera- ture 5°C and the exterior at 40°C. After an interval of time, the shell reaches a steady state with the temperature at each point within it remaining constant in time. (a) Explain why the rate of energy transfer P must be the same through each spherical surface, of radius r, within the shell and must satisfy dT_ dr 4rkr? (b) Next, prove that r0.07 r-2 dr 4 Tk Joos 40 dT = where Tis in degrees Celsius and ris in meters. (c) Find the rate of energy transfer through the shell. (d) Prove that dT = 1.84 Jo.03 | r? dr where Tis in degrees Celsius and r is in meters. (e) Find the temperature within the shell as a function of radius. (f) Find the temperature at r = 5.00 cm, halfway through the shell.

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A spherical shell has inner radius 3.00 cm and outer radius
7.00 cm. It is made of material with thermal conductivity
k = 0.800 W/m - °C. The interior is maintained at tempera-
ture 5°C and the exterior at 40°C. After an interval of time,
the shell reaches a steady state with the temperature at each
point within it remaining constant in time. (a) Explain why
the rate of energy transfer P must be the same through
each spherical surface, of radius r, within the shell and
must satisfy
dT_
dr
4rkr?
(b) Next, prove that
r0.07
r-2 dr
4 Tk Joos
40
dT =
where Tis in degrees Celsius and ris in meters. (c) Find the
rate of energy transfer through the shell. (d) Prove that
dT = 1.84
Jo.03
| r? dr
where Tis in degrees Celsius and r is in meters. (e) Find
the temperature within the shell as a function of radius.
(f) Find the temperature at r = 5.00 cm, halfway through
the shell.
Transcribed Image Text:A spherical shell has inner radius 3.00 cm and outer radius 7.00 cm. It is made of material with thermal conductivity k = 0.800 W/m - °C. The interior is maintained at tempera- ture 5°C and the exterior at 40°C. After an interval of time, the shell reaches a steady state with the temperature at each point within it remaining constant in time. (a) Explain why the rate of energy transfer P must be the same through each spherical surface, of radius r, within the shell and must satisfy dT_ dr 4rkr? (b) Next, prove that r0.07 r-2 dr 4 Tk Joos 40 dT = where Tis in degrees Celsius and ris in meters. (c) Find the rate of energy transfer through the shell. (d) Prove that dT = 1.84 Jo.03 | r? dr where Tis in degrees Celsius and r is in meters. (e) Find the temperature within the shell as a function of radius. (f) Find the temperature at r = 5.00 cm, halfway through the shell.
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