Question

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: (c).P = W tan(φ - α)

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

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