If the jack supports the 200-kg crate, determine the horizontal force that must be appli...
If the jack supports the 200-kg crate, determine the horizontal force that must be applied perpendicular to the handle at E to lower the crate. Each single square-threaded screw has a mean diameter of 25 mm and a lead of 7.5 mm. The coefficient of static friction is 
= 0.25.
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