Machine Design
Two closely coiled helical springs with stiffness k₁ and k₂ respectively are connected in series. The stiffness of an equivalent spring is given by

(k₁ - k₂)/ (k₁ + k₂)
(k₁ - k₂)/ (k₁ k₂)
(k₁ k₂)/ (k₁ + k₂)
(k₁ + k₂)/ (k₁ k₂)

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Machine Design
When the belt speed increases

Power transmitted increases to a maximum value and then decreases
Power transmitted increases
Power transmitted decreases
Power transmitted remains the same

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