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no. 2 ny gk tw
lo = 25cm = 0,25m
A = 5mm²
l = 30cm = 0,3 m
Dit:ε....?
Δl = l - lo
Δl = 0,3 - 0,25
Δl = 0,05 m
,
ε = Δl/lo
ε = 0,05/0,25
ε = 0,2
,
2. Diket:
F₁ = 12,5 N
lo = 20cm = 0,2m
l = 24cm = 0,24m
Δl₁ = l - lo
Δl₁ = 0,24 - 0,2
Δl₁ = 0,04m
F₂ = 37,5N
Dit: Δl oleh F2....?
k = F₁/Δl
k = 12,5/0,04
k = 312,5
,
Δl₂ = F₂/k
Δl₂ = 37,5/312,5
Δl₂ = 0,12 m
maka panjang pegas dgn gaya F₂ = 0,2 + 0,12 = 0,32 m = 32 cm