Sebuah tabung memiliki diameter 14 cm. Jika luas sellimut tabung 440 cm2, hitunlah volume gas dalam tabung !
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jwb
diameter = 14 cm
luas = 440 cm^2 (selimut)
r = d/2 (jari")
= 14 : 2
= 7
L = 2πrt
440 = 2 x π x 7 x t (tinggi)
= 44πt
= 440 : 44π
= 3,16
v = πr2t (volume gas)
= π x 72 x 3,16
= 156,8 cm^3
volume gas = 156,8 cm^3