7-54 The single-threaded screw of the floor jack has a pitch of 0.5 in. and a meanradius of 1.75 in. The angle of static friction is 8.5°. (a) Determine the couple Cthat must be applied to the screw to start lifting a weight of 4000 lb. (b) What isthe couple required to start lowering the weight?4000 IbAnswer:(а) 114.5 1b. -ft.(b) 60.2 lb.· ftFig. P7.54

Find the lead anglep=2πrtanθθ=tan-10.5in2×π×1.75inθ=2.601°

Answered: 7-54 The single-threaded screw of the…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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