In a screw jack, the effort required to lower the load W is given by Options: A . &nbsp$${\text{P}} = {\text{W}}\tan \left( {\alpha - \varphi } \right)$$ B . &nbsp$${\text{P}} = {\text{W}}\tan \left( {\alpha + \varphi } \right)$$ C . &nbsp$${\text{P}} = {\text{W}}\tan \left( {\varphi - \alpha } \right)$$ D . &nbsp$${\text{P}} = {\text{W}}\cos \left( {\alpha + \varphi } \right)$$

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

Question

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

Options:

A . $${\text{P}} = {\text{W}}\tan \left( {\alpha - \varphi } \right)$$

B . $${\text{P}} = {\text{W}}\tan \left( {\alpha + \varphi } \right)$$

C . $${\text{P}} = {\text{W}}\tan \left( {\varphi - \alpha } \right)$$

D . $${\text{P}} = {\text{W}}\cos \left( {\alpha + \varphi } \right)$$

Answer: Option C

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