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F1 = 80 N
F2 = 500 N
Dit:
A1 : A2
Jawab:
F1/A1 = F2/A2
F1/F2 = A1/A2
80/500 = (1/4πd1²) / (1/4πd2²)
8/50 = d1²/d2²
√8/50 = d1/d2
√4/25 = d1/d2
2/5 = d1/d2
Jadi perbandingannya d1 : d2 = 2 : 5 (C)
2) KM = W/F
F1/A1 = W/A2
A2/A1 = W/F
KM = A2/A1
Cek opsinya :
Opsi A
KM = 0,1 / 0,01
KM = 10
Opsi B
KM = 0,4 / 0,05
KM = 8
Opsi C
KM = 0,8 / 0,1
KM = 8
Opsi D
KM = 1,5 / 0,25
KM = 6
Berarti nilai keuntungan mekanis yang lebih besar adalah opsi A
Semoga membantu ^_^