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1 兩螺旋拉伸彈簧之彈簧常數分別為20N/cm及30N/cm。將它們串聯後,總彈簧常數應為多少N/cm? 91 統測
A 1/50 (N/cm)
B 1/12 (N/cm)
C 12 (N/cm)
D 50 (N/cm)

串聯:k = (k1×k2)(k1+k2)

k=(20×30)/(20+30)=12(N/cm)