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V = 1/3 phi r^2 t
5024 = 1/3 x 3,14 x 20 x 20 x t
t = 5024 / 418,67
t = 11,99
bulatkan jd 12
jawaban C
no 5)
volum air yg tersisa
= 2^3 - 4/3 x 3,14 x 1^3
= 8 - 4,186667
= 3,813333
jawaban A