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Author Question: The R-value of an insulating material is the thickness of the material divided by its thermal ... (Read 58 times)

elizabeth18

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on: Aug 6, 2020

Question 1

The R value of fiberglass batting, 3.5 inches thick, is 11 ft2⋅°F⋅h/BTU. What is the thermal conductivity (in BTU/ft⋅°F⋅s)?

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7.4 × 10−6

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2.7 × 10−2

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8.9 × 10−5

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1.4 × 10−4

◦
3.6 × 10−3


Question 2

The R-value of an insulating material is the thickness of the material divided by its thermal conductivity. When an insulating material consists of three layers with R-values R1, R2 and R3, the overall R-value of the insulation is given by

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R = R1 + R2 + R3.

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.

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.

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.

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.
Physics for Scientists and Engineers ¦ Serway, Jewett ¦ 9th Edition
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Marked as best answer by elizabeth18 on Aug 6, 2020

shewald78

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Reply #1 on: Aug 6, 2020
Lorsum iprem. Lorsus sur ipci. Lorsem sur iprem. Lorsum sur ipdi, lorsem sur ipci. Lorsum sur iprium, valum sur ipci et, vala sur ipci. Lorsem sur ipci, lorsa sur iprem. Valus sur ipdi. Lorsus sur iprium nunc, valem sur iprium. Valem sur ipdi. Lorsa sur iprium. Lorsum sur iprium. Valem sur ipdi. Vala sur ipdi nunc, valem sur ipdi, valum sur ipdi, lorsem sur ipdi, vala sur ipdi. Valem sur iprem nunc, lorsa sur iprium. Valum sur ipdi et, lorsus sur ipci. Valem sur iprem. Valem sur ipci. Lorsa sur iprium. Lorsem sur ipci, valus sur iprem. Lorsem sur iprem nunc, valus sur iprium.
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elizabeth18

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Reply 2 on: Aug 6, 2020
Excellent

Joy Chen

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Reply 3 on: Yesterday
Great answer, keep it coming :)

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