1.

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

A. P = W tan (α – φ)
B. P = W tan (α + φ)
C. P = W cos (α – φ)
D. P = W cos (α + φ)
Answer» C. P = W cos (‚âà√≠¬¨¬± ‚Äö√Ñ√∂‚àö√ë‚àö¬® ‚âà√¨‚àö√∫)


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