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In a screw jack of lead angle a, the effort required to lift the load Wis given by ........... ($$\phi$$ = Friction Angle)
$$P= W \tan (\alpha-\phi)$$
$$P= W \tan (\alpha+\phi)$$
$$P= W \cos (\alpha-\phi)$$
$$P= W \cos (\alpha+\phi)$$
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