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Verified answer
Nomor 10-------------
Diket :
Ketinggian satelit, h = 3600 km
Jari-jari bumi, R = 6400 km
Percepatan gravitasi di permukaan bumi, g = 10 m/s²
Tanya :
Kelajuan, V = __?
Jawab :
Step 1
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Hitung percepatan gravitasi bumi pada ketinggian, h = 3600 km
g'/g = [R/(h + R)]²
g'/g = [6400 / (3600 + 6400)]²
g'/g = [6400 / (10000)]²
g'/g = [16/25]²
g' = [16/25]²•g
g' = [16/25]²• 10 m/s²
Step 2
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V = √(g'.r)
Dimana :
r adalah jarak satelit ke pusat bumi
r = h + R
r = 3600 km + 6400 km
r = 10000 km
r = 10^7 m
Maka :
V = √(g'.r)
V = √([16/25]²• 10• 10^7)
V = √([16/25]²• 10^8)
V = 16/25• 10^4
V = 16•400
V = 6400 m/s
Atau
V = 6,4 km/s
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FZA