# All Questions

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### Simple Harmonic Motion with an unknown mass distribution [closed]

I've been trying to control a Segway robot using controllers and a bond graph model (I'm modelling it as an inverted pendulum on a cart), and I am not quite sure how to determine the moment of inertia ...
11 views

### Can life decrease the entropy of an isolated system?

A high entropy isolated system is shuffling through its more probable micro-states. Local entropy dip produce several structures. These structures, akin to life, feed on free energy to preserve ...
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### what's the difference between Laplace Force and Lorentz force?

Currently we are studying Laplace force, when I searched, I found also the Lorentz force, and I'm lost right now, I tried to understand it but I could not ! $$F=I\vec l \wedge \vec B$$ I didn't ...
20 views

### Physics 2 electricity and magnetism [closed]

A total charge $+Q$ is uniformly distributed over thee volume of an insulating sphere ($\text{radius}=R$). On the other hand, a spherical conducting shell of radius $2R$ and thickness $t$ encloses the ...
31 views

### Can electrons combine with neutrons to form negatively charged nuclei?

I've been wondering if electrons and protons could switch place such as constituent of an atom nuclei or that a proton "orbits" an electron instead ("inverted" hydrogen), are there forces on the quark ...
17 views

### Right-hand rule for fields example problem

For context, I've started reading "Classical Mechanics" by John Taylor and I have a small problem with one of his examples: He gives an example of the magnetic force between two moving charges as an ...
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28 views