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f1/1 = 3200/40
40f1 = 3200
f1 = 3200/40
= 80
A = πr² = π. 1/2 ² = 1/4π
d besar = 40 ⇒ r besar = 20
A =πr² = π x 20² = 400π
F besar = 3200N
seimbang :
P kecil = P besar
Fk = Fb
Ak Ab
Fk = 3200
0.25π 400π
Fk = 3200 x 0.25
400
= 2 N