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L = 72 cm ---> 0,72 m
A = 4 mm² ---> 4 x 10⁻⁶ m²
F = 2,8 N
ΔL = 0,06 cm ---> 6 x 10⁻⁴ m
modulus elastisitas :
tegangan / regangan
Tegangan = F / A
= 2,8 / 4 x 10⁻⁶
= 7 x 10⁵ N / m²
Regangan = ΔL / L
= 6 x 10⁻⁴ / 0,72
= 8,3 x 10⁻⁴
~ 8 x 10⁻⁴
Modulus elastisitas : 7 x 10⁵ / 8 x 10⁻⁴
= 7/8 x 10⁹
= 0,875 x 10⁹
= 8,75 x 10⁸ N/m²