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= 25 / 100.000
= 5 / 20.000
= 1 / 4000 m³
m = 10 g = 10 / 1000 kg
= 1/100 kg
W udara = m. g
= 1/100. 10
= 1 / 10 N
= 0,1 N
W cair = 80 N
Fa = W ud - W cair
= 0,1 - 80 N
= - 79,9 N (negatif artinya soal ada kekeliruan dalam nilai W cair)
syarat : W udara > W cair