# Tagged Questions

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2k views

### Why is the simple harmonic motion idealization inaccurate?

While in my physics classes, I've always heard that the simple harmonic motion formulas are inaccurate e.g. In a pendulum, we should use them only when the angles are small; in springs, only when the ...
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### Pendulum motion equation issue

The differential equation that gives the equation of motion of a pendulum where: $m$ is the mass $L$ is the distance between the pivot and the body's centre of mass $g$ is the acceleration due to ...
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### What is the displacement between highest points on a pendulum with discontinuous forcing? And is this dependent on gravity?

I know the question is worded horrendously, but my professor gives strange badly worded problems, so I've started to speak that way. It'll take a paragraph to pose this question properly. Consider a ...
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### What could be the anharmonicity effect if phonon interact with a tilted interface?

If Phonon propagates through c-axis grown structure and at the end reach a tilted interface of GaN, what phenomena will appear there? How anharmonicity is going to effect the phonon propagation there?...
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### The role of anharmonic oscillator(s) in Heisenberg's 1925 paper

I am talking about the most famous paper of Heisenberg, which I know from the translation of van der Waerden (Sources in Quantum mechanics, North Holland, 1967). After introducing matrix mechanics ...
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### Solving the quantum an-harmonic oscillator pertubatively?

Background Generally while solving the quantum an-harmonic oscillator: $$-\frac{d^2 y}{dx^2} + k_1 x^4 y + k_2 x^2 y= E y$$ Most people (I've googled) on the internet always solve this using: ...