13. A skip for a mine shaft weighs 2000 lb and is to lift a maximum load of 3000 lb from a depth of 1000 ft. The maximum speed of 20 fps is attained in 5 seconds. a. What sizes of 6x19, IPS rope and sheave should be used for indefinite life and N = 1.3 on the basis of fatigue? b. What is the design factor on the static basis? c. What sizes of rope and sheave are required if the number of cycles (bending and unbending) in the desired life is 200,000?What is the corresponding static design factor?
13. A skip for a mine shaft weighs 2000 lb and is to lift a maximum load of 3000 lb from a depth of 1000 ft. The maximum speed of 20 fps is attained in 5 seconds. a. What sizes of 6x19, IPS rope and sheave should be used for indefinite life and N = 1.3 on the basis of fatigue? b. What is the design factor on the static basis? c. What sizes of rope and sheave are required if the number of cycles (bending and unbending) in the desired life is 200,000?What is the corresponding static design factor?
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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Transcribed Image Text:13. A skip for a mine shaft weighs 2000 lb and is to lift a maximum load of 3000 lb
from a depth of 1000 ft. The maximum speed of 20 fps is attained in 5 seconds.
a. What sizes of 6x19, IPS rope and sheave should be used for indefinite life
and N = 1.3 on the basis of fatigue?
b. What is the design factor on the static basis?
c. What sizes of rope and sheave are required if the number of cycles (bending
and unbending) in the desired life is 200,000?What is the corresponding static
design factor?
d. What is the elongation of the rope found in c.), if the 3,000 lb load is added
while the hoist hangs free at the bottom?
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