In a screw jack, the effort required to lower the load W is given by

1.

In a screw jack, the effort required to lower the load W is given by

[A].	P = W tan(α - φ)
[B].	P = W tan(α + φ)
[C].	P = W tan(φ - α)
[D].	P = W cos(α + φ)

Answer: Option C

Explanation:

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