Material Gold Copper Aluminum Stainless Steel Water Ethyl Alcohol Ice α (°C-¹) 1.65×10-5 2.3x10-5 1.75×10-5 c (J/(kg K)) | C (J/(mol K)) 129 25 4190 75 2400 110 2090 37.6 Lv (J/kg) density (kg/m³) 19,300 8,960 2,700 7,500 1,000 790 917 Lƒ (J/kg) 3.33×105 22.6×105 1.09×105 8.79x105
Material Gold Copper Aluminum Stainless Steel Water Ethyl Alcohol Ice α (°C-¹) 1.65×10-5 2.3x10-5 1.75×10-5 c (J/(kg K)) | C (J/(mol K)) 129 25 4190 75 2400 110 2090 37.6 Lv (J/kg) density (kg/m³) 19,300 8,960 2,700 7,500 1,000 790 917 Lƒ (J/kg) 3.33×105 22.6×105 1.09×105 8.79x105
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Transcribed Image Text:a (°℃−¹)
Material
Gold
Copper
Aluminum
1.65×10-5
2.3x10-5
Stainless Steel 1.75×10-5
Water
Ethyl Alcohol
Ice
1 atm = 1.01×105 Pa
NA = 6.022×102³ particles/mol
R = 8.3145 J/(mol K)
kB = 1.38×10-23 J/K
o = 5.67 × 10-8W/(m²K4)
c (J/(kg K)) C (J/(mol K)) | Lf (J/kg) Lv (J/kg) density (kg/m³)
129
25
19,300
8,960
2,700
7,500
4190
75
1,000
3.33×105 22.6×105
1.09×105 8.79×105
2400
110
790
2090
37.6
917

Transcribed Image Text:The density of air as a function of altitude above sea level is modeled as p(z) = Poez/zo, where po = 1.2
kg/m³, and Z₁ = 16, 855 m. A spherical balloon with radius r = 0.2 m is filled with Helium gas (MHe = 4
g/mol) to STP (P = 1 atm, T = 273 K). What is the maximum height the balloon can float up to
assuming constant pressure and temperature within the balloon? Assume that the density of air is
constant across the volume of the balloon for a specific height, and that the balloon's rubber has
negligible mass.
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