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Mr. Dubey • 100.64K Points
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Q. In a screw jack, the effort required to lower the load W is given by

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