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Diketahui :
Ek1 = 6000 J
v2 = 2v1
Ditanyakan : Ek2 ?
Dijawab :
Ek1/Ek2 = 1/2m v1² / 1/2m v2² ... 1/2 m habis dibagi
6000/Ek2 = v1² / 2v1²
6000/Ek2 = v1²/4v1²
6000/Ek2 = 1/4
Ek2 = 6000 x 4
Ek2 = 24.000 J
Nomor 7 :
Rparalel =
1/Rp = 1/3 + 1/3
1/Rp = 2/3
Rp = 3/2
Rp = 1,5 ohm
Rseri = 2 +2 + 1,5 = 5,5 ohm
Tegangan :
V = I x R
= 10 x 5,5
= 55 Volt