A 2 lb weight stretches a spring 6 inches in equilibrium. An external force F(t) = sin 8t lb is ap- plied to the weight, which is released from rest 2 inches below equilibrium. Find its displacement for t > 0.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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12.
C/G A 4 lb weight stretches a spring 1 ft in equilibrium. An external force F(t) = .25 sin 8t
lb is applied to the weight, which is initially displaced 4 inches above equilibrium and given a
downward velocity of 1 ft/s. Find and graph its displacement for t > 0.
13. A 2 lb weight stretches a spring 6 inches in equilibrium. An external force F(t) = sin 8t lb is ap-
plied to the weight, which is released from rest 2 inches below equilibrium. Find its displacement
for t > 0.
14.
A 10 gm mass suspended on a spring moves in simple harmonic motion with period 4 s. Find the
period of the simple harmonic motion of a 20 gm mass suspended from the same spring.
Transcribed Image Text:12. C/G A 4 lb weight stretches a spring 1 ft in equilibrium. An external force F(t) = .25 sin 8t lb is applied to the weight, which is initially displaced 4 inches above equilibrium and given a downward velocity of 1 ft/s. Find and graph its displacement for t > 0. 13. A 2 lb weight stretches a spring 6 inches in equilibrium. An external force F(t) = sin 8t lb is ap- plied to the weight, which is released from rest 2 inches below equilibrium. Find its displacement for t > 0. 14. A 10 gm mass suspended on a spring moves in simple harmonic motion with period 4 s. Find the period of the simple harmonic motion of a 20 gm mass suspended from the same spring.
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