
Concept explainers
(a)
The frequency of vibration.

Answer to Problem 19.37P
Frequency
Explanation of Solution
Given information:
Weight of rod AB = 9Kg
Spring constant
The free body diagram of the given bar is as follows:
The length of the bar is calculated as:
Then,
Now,
Now, by Hook’s law,
And force at point A,
At point B,
Now taking moment about point C,
In equilibrium position;
Then,
But for bar
Thus,
Thus, the equation is in the form of equation of vibration:
Thus, natural frequency
And frequency,
(b)
The amplitude of angular motion of rod.

Answer to Problem 19.37P
Amplitude of angular motion,
Explanation of Solution
Given information:
Weight of rod AB = 9Kg
Spring constant
Velocity at point A=1.1mm/s
The free body diagram of the given bar is as follows:
The length of the bar is calculated as:
Then,
Now,
Now, by Hook’s law,
And force at point A,
At point B,
Now taking moment about point C,
In equilibrium position;
Then,
But for bar
Thus,
Thus, the equation is in the form of equation of vibration:
Thus, natural frequency
Amplitude:
At Maximum point:
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Chapter 19 Solutions
Vector Mechanics For Engineers
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