close-coiled helical spring of 18 mm mean coil diameter and 10 turns is manged within and concentric with an outer spring. The free length of the inner spring is 4 mm more than that of the outer. The outer spring has 12 coils of mean diameter 30 mm and wire diameter 35 mm. The spring load against which a valve is opened is provided by the inner spring. The initial Compression in outer spring is 6 mm when the valve is closed. Calculate: (i) The stiffness of the inner spring if the greatest force required to open the valve by 9 mm is 150 N. (ii) The diameter of the wire of the inner spring.

close-coiled helical spring of 18 mm mean coil diameter and 10 turns is manged within and concentric with an outer spring. The free length of the inner spring is 4 mm more than that of the outer. The outer spring has 12 coils of mean diameter 30 mm and wire diameter 35 mm. The spring load against which a valve is opened is provided by the inner spring. The initial Compression in outer spring is 6 mm when the valve is closed. Calculate: (i) The stiffness of the inner spring if the greatest force required to open the valve by 9 mm is 150 N. (ii) The diameter of the wire of the inner spring.

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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Concept explainers

Buckling of columns

The column is described as a vertical member of the structure that carries an axial compressive load, and buckling is a lateral deformation of the column under the application of load.

Question

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A close-coiled helical spring of 18 mm mean coil diameter and 10 turns is
menged within and concentric with an outer spring. The free length of the inner spring is 4 mm
oe than that of the outer. The outer spring has 12 coils of mean diameter 30 mm and wire diameter
35 mm. The spring load against which a valve is opened is provided by the inner spring. The initial
compression in outer spring is 6 mm when the valve is closed. Calculate:
(i) The stiffness of the inner spring if the greatest force required to open the valve by 9 mm
is 150 N.
(ii) The diameter of the wire of the inner spring.

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