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A vehicle jack has single start square thread, a 20 mm major diameter and a pitch of 3 mm. A plain thrust collar of 30 mm diameter is used. Coefficients of running friction are 0.15 and 0.1 for the screw and collar respectively.

A vehicle jack has single start square thread, a 20 mm major diameter and a pitch of 3 mm. A plain thrust collar of 30 mm diameter is used. Coefficients of running friction are 0.15 and 0.1 for the screw and collar respectively.

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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A vehicle jack has single start square thread, a 20 mm major diameter and a pitch of 3 mm. A plain thrust collar of 30 mm diameter is used. Coefficients of running friction are 0.15 and 0.1 for the screw and collar spec What is the thread root diameter d, ? (Answer in mm) Answer: What is the mean diameter, dm, of the screw? (Answer in mm) Answer: What is the load, W, on the power screw, if the power screw jack supports a mass of P = 1172 kg? Assume that the arms of the jack are at an angle of 8 33°, as shown in the diagram. O a. 10555.0N O b. 8852.2N O c. 6854.5 N O d. 17704.3 N What is the running torque required to raise the mass of P = 1172 kg. when e = 33° ? (Answer in N.m)
Transcribed Image Text:A vehicle jack has single start square thread, a 20 mm major diameter and a pitch of 3 mm. A plain thrust collar of 30 mm diameter is used. Coefficients of running friction are 0.15 and 0.1 for the screw and collar spec What is the thread root diameter d, ? (Answer in mm) Answer: What is the mean diameter, dm, of the screw? (Answer in mm) Answer: What is the load, W, on the power screw, if the power screw jack supports a mass of P = 1172 kg? Assume that the arms of the jack are at an angle of 8 33°, as shown in the diagram. O a. 10555.0N O b. 8852.2N O c. 6854.5 N O d. 17704.3 N What is the running torque required to raise the mass of P = 1172 kg. when e = 33° ? (Answer in N.m)
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