Machine Design
In levers, leverage is the ratio of

Load lifted to the effort applied
Load arm to the effort arm
Mechanical advantage to the velocity ratio
Effort arm to the load arm

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Machine Design
The fatigue stress concentration factor is defined as

All of these
The ratio of endurance limit with stress concentration to the endurance limit without stress concentration
The product of the endurance limits with and without stress concentration
The ratio of endurance limit without stress concentration to the endurance limit with stress concentration

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