A bolt of mass 10 g is welded tangentially to the end of a torsion spring with a 3.5 cm radius. The spring is attached to the center of the board with the bolt resting

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
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A bolt of mass 10 g is welded
tangentially to the end of a torsion
spring with a 3.5 cm radius. The
spring is attached to the center of
the board with the bolt resting
horizontally at equilibrium directly
above the center of the spring.
(a) The board is rotated 78º, at
which time the bolt points
vertically. What is the stiffness of
the torsion spring.
(b) If the board is rotated to 90°,
then what is the extension of the
spring in radians?
Transcribed Image Text:A bolt of mass 10 g is welded tangentially to the end of a torsion spring with a 3.5 cm radius. The spring is attached to the center of the board with the bolt resting horizontally at equilibrium directly above the center of the spring. (a) The board is rotated 78º, at which time the bolt points vertically. What is the stiffness of the torsion spring. (b) If the board is rotated to 90°, then what is the extension of the spring in radians?
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