The data listed in the following table gives hourly measurements of heat flux q ( cal / cm 2 /h ) at the surface of a solar collector. As an architectural engineer, you must estimate the total heat absorbed by a 150,000 -cm 2 collector panel during a 14-h period. The panel has an absorption efficiency e a b of 45%. The total heat absorbed is given by h = e a b ∫ 0 t q A d t Where A = area and q = heat flux. t 0 2 4 6 8 10 12 14 Q 0.10 5.32 7.80 8.00 8.03 6.27 3.54 0.20
The data listed in the following table gives hourly measurements of heat flux q ( cal / cm 2 /h ) at the surface of a solar collector. As an architectural engineer, you must estimate the total heat absorbed by a 150,000 -cm 2 collector panel during a 14-h period. The panel has an absorption efficiency e a b of 45%. The total heat absorbed is given by h = e a b ∫ 0 t q A d t Where A = area and q = heat flux. t 0 2 4 6 8 10 12 14 Q 0.10 5.32 7.80 8.00 8.03 6.27 3.54 0.20
Solution Summary: The author calculates the total heat absorbed by the collector panel during a 14 h period.
The data listed in the following table gives hourly measurements of heat flux q
(
cal
/
cm
2
/h
)
at the surface of a solar collector. As an architectural engineer, you must estimate the total heat absorbed by a 150,000
-cm
2
collector panel during a 14-h period. The panel has an absorption efficiency
e
a
b
of 45%. The total heat absorbed is given by
Question 14
Use differentials to estimate the amount of paint needed to apply a coat of
paint 0.01 inch thick to a cube with edge 6 inches.
(a). 1.08 cubic inches
(b). 2.16 cubic inches
(c). 10.8 cubic inches
(d). 21.6 cubic inches
A)b
D.
B.
Sounds are produced when vibrating objects create pressure waves in some medium such as air. When these variations in
pressure reach the human eardrum, it causes the eardrum to vibrate in a similar manner and the ear detects sound. The
intensity of sound is measured as power per unit area. The threshold for hearing (minimum sound detectable by a young,
healthy ear) is defined to be 10 = 10-12 W/m2 (watts per square meter). The sound level L, or "loudness" of sound, is
where I is the intensity of the given sound. Use this formula for Exercise.
measured in decibels (dB) as L = 10 log(
a. Find the sound level of a motorcycle if its intensity is 1010 times 10.
b. Find the sound level of a vacuum cleaner if its intensity is 107 times 10.
c. How many times more intense is the sound of a motorcycle than a vacuum cleaner?
935
936
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