A screw-jack with helix angle of thread θ, and angle of friction β has the maximum efficiency if

1
\(\rm 2\beta=\frac{\pi}{2}-\theta\)
2
\(\rm 2\theta=\frac{\pi}{2}-\beta\)
3
\(\rm \theta=\frac{\pi}{2}-\beta\)
4
\(\rm \beta=\frac{\pi}{2}-\theta\)

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