2. Sebuah silinder terbuat dari baja dengan panjang 10 m dan diameter 4 cm. hitunglah pertambahan panjang silinder jika diberi gaya 105 N ! (E = 2.1011 N/m2)
liliput01
Diket: lo = 10 m D = 4cm ---> r = 2cm = 2.10⁻² m A = π r² A = 3,14 (2.10⁻²)² A = 3,14 (4.10⁻⁴) A = 12,56.10⁻⁴ m² F = 105 N E = 2.10¹¹ N/m² Dit: Δl....? E = F/A x lo/Δl Δl = (F. lo)/(E . A) Δl = (105 x 10)/(2.10¹¹ x 12,56.10⁻⁴) Δl = 1050/25,12x10⁷ Δl = 1050/2512x10⁵ Δl = 0,4 x 10⁻⁵ m
lo = 10 m
D = 4cm ---> r = 2cm = 2.10⁻² m
A = π r²
A = 3,14 (2.10⁻²)²
A = 3,14 (4.10⁻⁴)
A = 12,56.10⁻⁴ m²
F = 105 N
E = 2.10¹¹ N/m²
Dit: Δl....?
E = F/A x lo/Δl
Δl = (F. lo)/(E . A)
Δl = (105 x 10)/(2.10¹¹ x 12,56.10⁻⁴)
Δl = 1050/25,12x10⁷
Δl = 1050/2512x10⁵
Δl = 0,4 x 10⁻⁵ m