Machine Design
The rated life of a bearing varies

Inversely as cube of load
Directly as load
Inversely as fourth power of load
Inversely as square of load

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Machine Design
In the calculation of induced shear stress in helical springs, the Wahl's stress factor is used to take care of

Combined effect of torsional shear stress and transverse shear stress in the wire
Combined effect of bending stress and curvature of the wire
Combined effect of transverse shear stress and curvature of wire
Combined effect of transverse shear stress and bending stress in the wire

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