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Nomor 11-----------
Diket :
Berat benda di permukaan bumi, w1 = 200 N
Jari-jari bumi, R
Tanya :
Berat benda, w2 = __?
Pada Ketinggian benda, h = 3R dari permukaan bumi
Jawab :
w2/w1 = [R / (h + R)]²
w2/w1 = [R / (3R + R)]²
w2/w1 = [R / 4R]²
w2/w1 = [1 / 4]²
w2/w1 = (1/16)
w2 = (1/16)•w1
w2 = (1/16)•200
w2 = 12,5 N
Nomor 12
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Diket :
Perbandingan jari-jari orbit planet A dan B ke matahari,
Ra : Rb = 1 : 4
Periode planet A, Ta = 88 hari
Tanya :
Periode planet B, Tb = __?
Jawab :
Hukum kepler III
(Tb/Ta)² = (Ra/Rb)³
(Tb/88)² = (1/4)³
(Tb/88)² = 1 / (4•4•4)
Tb/88 = √ 1 / (4•4•4)
Tb/88 = 1 / 2•2•2
Tb/88 = 1/8
Tb = (1/8)• 88
Tb = 11 hari
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