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Tegangan = F / A
F = gaya -- > m.g -- > 8.10 = 80
A = luas permukaan -- > π . r²
r = jari jari
= diameter / 2
= 0,13 / 2
= 0,065 cm = 0,00065 m
Regangan = Δ l / l
Δ l = perubahan panjang
= 0,035 cm = 0,00035 m
l = panjang awal
= 75 cm = 0,75 m