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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 spring package with two springs and an external force, 200N. The short spring has a loin of 35 mm. Constantly looking for spring for short spring so that total compression is 35 mm (d). Known values:
Long spring:                        Short spring:
C=3.98 N/mm                    Lo=65mm
Lo=87.4mm
F=c·f
Total compression is same for both spring.
                           
200 = (3.98(c1) × 35) + (c₂ × 35)

200 = 139.3 + 35c₂

200 - 139.3 = 35c₂

60.7 = 35c₂

c₂ = 60.7/35

Short spring (c₂) = 1.73 N/mm

According to my study book, the correct answer is 4.82N/mm

What is wrong with the calculating?

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