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8. E = 1/2 kx²
0,16 = 1/2 x k x 0,04²
0,16 = 0.0008 k
k = 200 N/m
F = kx
= 200 N/m x 0.02 m
= 4 N
9. tegangan
P = F/A
= 100 N / 0.000002 m²
= 0,0002 N/m²
regangan = Δx/x
= 0,001 m / 0,14 m
= 1/140
y = tegangan/regangan
= 0,0002/ (1/140)
= 0.028
(ga ada jawabannya)
10. m = 0,5 kg
F = mg = 5 newton
Δx = 12,5 cm = 0.125 m
k = F/Δx
= 5/0,125 = 40 N/m
1/kt = 1/k₁ + 1/k₂ + 1/k₃ + 1/k₄ +1/k₅
1/40 = 1/k₁ + 1/k₂ + 1/k₃ + 1/k₄ +1/k₅
1/40 = 1/k₁ + 1/k₂ + 1/k₃ + 1/k₄ +1/k₅
5/200 = 1/k₁ + 1/k₂ + 1/k₃ + 1/k₄ +1/k₅
semua k identik sehinggga
5/200 = 5/k
200 = k
k = 200 N/m
11. k = k₁ + k₂
= 2 + 2 = 4 N/m
12. paralel
500 + 500 = 1000 N/m
seri
1/kt = 1/1000 + 1/250
= 1/1000 + 4/1000
= 5/1000
kt = 1000/5 = 200 N/m
13. F₁/F₂ = d₁²/d₂²
F₁/32000 = 1²/40²
F₁/32000 = 1/1600
F₁ = 20 N
14. P = ρ g h
= 1000 kg/m³ x 10 x 5
= 50000 pascal
F = P A
= 50000 x 5 x 40
= 10.000.000 Newton