Theory of Machine
Efficiency of a screw jack is given by

tanα/tan (α +φ)
tan (α - φ)/tanα
tan (α + φ)/tanα
tanα/tan (α - φ)

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Theory of Machine
Inertia force acts

Along the direction of acceleration force
Opposite to the direction of acceleration force
None of the listed here
Perpendicular to the acceleration force

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