Share
An object suspended from a spring vibrates with simple harmonic motion. Part A At an instant when the displacement of the object is equal to
Question
An object suspended from a spring vibrates with simple harmonic motion. Part A At an instant when the displacement of the object is equal to one-fourth the amplitude, what fraction of the total energy of the system is kinetic
in progress
0
Physics
3 years
2021-08-26T19:23:02+00:00
2021-08-26T19:23:02+00:00 1 Answers
1 views
0
Answers ( )
Complete Question
An object suspended from a spring vibrates with simple harmonic motion.
a. At an instant when the displacement of the object is equal to one-half the amplitude, what fraction of the total energy of the system is kinetic?
b. At an instant when the displacement of the object is equal to one-half the amplitude, what fraction of the total energy of the system is potential?
Answer:
a
The fraction of the total energy of the system is kinetic energy![Rendered by QuickLaTeX.com \frac{KE}{T} = \frac{3}{4}](https://documen.tv/wp-content/ql-cache/quicklatex.com-16c486c01ffb0e849865217a3eb87f82_l3.png)
b
The fraction of the total energy of the system is potential energy![Rendered by QuickLaTeX.com \frac{PE}{T} = \frac{1}{4}](https://documen.tv/wp-content/ql-cache/quicklatex.com-6b1dbb233f5e71b9987a60ac1c936998_l3.png)
Explanation:
From the question we are told that
The displacement of the system is![Rendered by QuickLaTeX.com e = \frac{a}{2}](https://documen.tv/wp-content/ql-cache/quicklatex.com-969235431de6681406c4d1106e762908_l3.png)
where a is the amplitude
Let denote the potential energy as PE which is mathematically represented as
=>![Rendered by QuickLaTeX.com PE = \frac{1}{2} * k* [\frac{a}{2} ]^2](https://documen.tv/wp-content/ql-cache/quicklatex.com-0651a4f83379a9a30d4334b742892497_l3.png)
Let denote the total energy as T which is mathematically represented as
Let denote the kinetic energy as KE which is mathematically represented as
=>![Rendered by QuickLaTeX.com KE =k [ \frac{a^2}{2} - \frac{a^2}{8} ]](https://documen.tv/wp-content/ql-cache/quicklatex.com-612d717de18613e2bc39a6ffa4e8d6be_l3.png)
=>![Rendered by QuickLaTeX.com KE =k [ \frac{3}{8} a^2 ]](https://documen.tv/wp-content/ql-cache/quicklatex.com-35355b84093a48e06ec6ec44d2c6822a_l3.png)
Now the fraction of the total energy that is kinetic energy is
Now the fraction of the total energy that is potential energy is