) A simple harmonic oscillator of amplitude A has a total energy E. Determine a) the kinetic energy nd b) the potential energy when the position is one third the amplitude. c) For what values of the position does the kinetic energy equal one half the potential energy? d) Are there any values of the position where the kinetic energy is greater than the maximum potential energy? Explain. (a: 8E/9, : E/9, c: A = Aar V2/3 , d: not giving this one)
Simple harmonic motion
Simple harmonic motion is a type of periodic motion in which an object undergoes oscillatory motion. The restoring force exerted by the object exhibiting SHM is proportional to the displacement from the equilibrium position. The force is directed towards the mean position. We see many examples of SHM around us, common ones are the motion of a pendulum, spring and vibration of strings in musical instruments, and so on.
Simple Pendulum
A simple pendulum comprises a heavy mass (called bob) attached to one end of the weightless and flexible string.
Oscillation
In Physics, oscillation means a repetitive motion that happens in a variation with respect to time. There is usually a central value, where the object would be at rest. Additionally, there are two or more positions between which the repetitive motion takes place. In mathematics, oscillations can also be described as vibrations. The most common examples of oscillation that is seen in daily lives include the alternating current (AC) or the motion of a moving pendulum.
![### Simple Harmonic Oscillator Energy Analysis
**Problem Statement:**
A simple harmonic oscillator of amplitude \( A \) has a total energy \( E \). Determine the following:
1. (a) The kinetic energy and (b) the potential energy when the position is one-third the amplitude.
2. (c) For what values of the position does the kinetic energy equal one-half the potential energy?
3. (d) Are there any values of the position where the kinetic energy is greater than the maximum potential energy? Explain.
**Answers:**
- **(a)** When the position is one-third the amplitude:
- Kinetic Energy: \( \frac{8E}{9} \)
- **(b)** When the position is one-third the amplitude:
- Potential Energy: \( \frac{E}{9} \)
- **(c)** For the position at which kinetic energy equals half the potential energy:
- Position: \( A = A_{\text{max}} \sqrt{\frac{2}{3}} \)
- **(d)** Not provided.
### Explanation of Concepts:
- Simple harmonic oscillators (SHOs) involve sinusoidal motion where potential and kinetic energies interchange but sum up to a constant total energy.
- At maximum amplitude \( A \), the potential energy is maximized, and kinetic energy is zero.
- At equilibrium (zero position), potential energy is zero, and kinetic energy is maximized.
### Detailed Calculations:
1. **For part (a) and (b):**
- **Potential Energy \( U \):** \( U = \frac{1}{2}k x^2 \)
- **Kinetic Energy \( K \):** \( K = E - U \)
- If the position \( x \) is \( \frac{A}{3} \):
- \( U = \frac{1}{2} k \left(\frac{A}{3}\right)^2 = \frac{1}{2} k \frac{A^2}{9} = \frac{k A^2}{18} \)
- Since \( E = \frac{1}{2} k A^2 \):
- \( U = \frac{E}{9} \)
- Thus, \( K = E - U = E - \frac{E}{9} = \frac{8E}{9} \)
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