(c) Estimate the efficiency of the jack for raising the load. (d) Estimate the power required to drive the screw at a constant 1 revolution per second. Schematic and Given Data: Load 50 kN

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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A car jack uses a single square-thread screw to raise a known load. The major diameter and pitch of the screw and the thrust collar mean diameter are known. Running friction coefficients are estimated. Find: 

(a) Determine the thread depth and helix angle.

(b) Estimate the starting torque for raising and lowering the load.

(c) Estimate the efficiency of the jack for raising the load. 

(d) Estimate the power required to drive the screw at a constant 1 revolution per second. Schematic and Given Data: Load 50 kN

NOTE: ANSWER ONLY LETETRS C AND D.

Load
50 kN
d
Single square-thread screw
D = 36 mm
p = 6 mm
dc = 80 mm
f = 0.2
f = 0.16
Transcribed Image Text:Load 50 kN d Single square-thread screw D = 36 mm p = 6 mm dc = 80 mm f = 0.2 f = 0.16
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