(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
(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
Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN:9781305578296
Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Chapter6: Fasteners
Section: Chapter Questions
Problem 12RQ
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Question
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.
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