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a. diketahui : xo (panjang awal) = 20 cm
F = 20 N dan xt (panjang akhir) = 25 cm
ditanyakan : k (konstanta pegas) ?
jawab :
k=F/∆x
=20/25-20
=20/5 = 4 N/cm
atau jika satuannya N/m
k = F/∆x
= 20/0,25-0,2
= 20/0,05 = 400 N/m
7. diketahui : k1 = 200 N/m; k2 = 300 N/m; k3 = 600 N/m dan F = 50 N
ditanyakan : ∆x ?
jawab :
1/k stotal = 1/k1 + 1/k2 + 1/k3
= 1/200 + 1/300 + 1/600 = 6/600
k stotal = 600/6 = 100
∆x = F/k stotal
= 50/100
= 0,5 m atau 50 cm