Theory of machines - Engineering

Q1:

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)

ANS:C - P = W tan(φ - α)

Explanation: No answer description is available.