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This question belongs to Civil Engineering Strength Of Materials

Strength of Materials

?

The effort required to lift a load W on a screw jack with helix angle $$\alpha $$ and angle of friction $$\varphi $$ is equal to

A) $${\text{W}}\tan \left( {\alpha + \varphi } \right)$$ B) $${\text{W}}\tan \left( {\alpha - \varphi } \right)$$ C) $${\text{W}}\cos \left( {\alpha + \varphi } \right)$$ D) $${\text{W}}\sin \left( {\alpha + \varphi } \right)$$

Answer & Solution

Correct Answer: Option A

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