# Questions tagged [dissipation]

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2answers
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### Elastic or inelastic collision?

When two billiard balls collide in normal situation (on earth) we hear the sound due to their impact. This is a sufficient proof that the collision is inelastic in nature due to loss of energy in the ...
1answer
442 views

### Why the name “relaxation time”?

Trying to explain to myself the Stokes number, I was linked by Wikipedia to this article: http://en.wikipedia.org/wiki/Relaxation_(physics) In that article, if $\tau$ is the relaxation time, then ...
2answers
4k views

### Why do power lines use high voltage?

I have just read that using high voltage results in low current, which limits the energy losses caused by the resistance of the wires. What I don't understand is why it works this way. Does it have ...
3answers
299 views

### RMS Values in AC Circuits

When do you use RMS values when calculating power? My physics textbook provides several equations for determining the power dissipated in AC circuits. For example, there are power equations using ...
2answers
771 views

### What is the difference between damping and elasticity forces?

From DYNAMICS OF STRUCTURES, Third edition, by Ray W. Clough and Joseph Penzien Damping has much less importance in controlling the maximum response of a structure to impulsive loads than for ...
1answer
385 views

### Lagrangian for an oscillator with position-dependent damping

I wonder if the equation of motion of an oscillator with (position-dependent) damping \begin{equation*} \ddot{x}+\gamma(x)\dot{x}+\omega_{0}^{2}x=0 \end{equation*} can be derived directly from ...
2answers
114 views

### Superconductor surface resistance

If the superconductive state is due to a phase transition from ohmic to a state a zero-resistivity, why the superconductive materials are usually identified by their surface resistance, or by their ...
2answers
673 views

0answers
136 views

### Wronskian of complex second order linear differential equation [closed]

While studying certain analogue gravity models I came across a differential equation of the form: \begin{align} \frac{d^2y}{dz^2} + \omega^2 (z)~ y(z) = 0 \end{align} where $z$ is a complex variable ...
5answers
1k views

### A conceptual doubt regarding Forced Oscillations and Resonance

While studying about the Resonance and Forced Oscillations, I came across a graph in my textbook that is given below:- Now, the author writes As the amount of damping increases, the peak shifts ...
1answer
82 views

### Help with my bouncy ball lab (I know the factors just not how to approach them) [closed]

In my physics lab we need to determine the factors that account for the energy "loss" during a high bounce ball bounce. I know that energy is "lost" (not really) to heat, air resistance, and sound. ...
8answers
495 views

### Why not use our own light production to produce new energy instead of wasting it?

Why don't we use our own light production at night (I mean home, buildings, streets,..., lighting) to charge photovoltaic panels instead of wasting it?
2answers
593 views

### Dissipative forces and reversible processes

A book that I have contains the following lines: For a process to be reversible, the dissipative forces such as viscosity and friction should be absent. My question is why?