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jawaban C
17. ρb = 5 g/cm3 = 5000 kg/m3 dan ρa= 1 g/cm3 = 1000 kg/m3
FA = ρa x g x Vb = ρa x g x (m /ρb) = 1000 x 10 x (10 / 5000) = 20 N
jawaban E
18. T = 27 + 273 =300 K
n = (P x V) / (R x T) = (1 x 1 ) / (0,082 x 300) = 0,0407 mol
Mr O2 = 2 x 16 =32
m = n x Mr = 0,0407 x 32 = 1,3024 = 1,30 gram
Jawaban E
20. P1 x V1 = P2 x V 2
0,2 x 80 = P2 x 0,05
P2 = 16/0,05 = 320 cmHg
Jawaban D
mbola = 0,5 kg
d = 10 cm =0,1 m
r = d/2 =0,05 m
Vbola = 4/3 π r^3 = 4/3 x 3.14 x 0,000125 = 0,00052 m^3
ρ = mbola / Vbola = 0,5 / 0,00052 = 961,54 kg/m^3
^ = pangkat