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Since you specify in the title that you're asking about ways to "aquire gravity", I'm going to assume that by "natural gravity" in the question body you refer to a gravitational acceleration substa...
As we start on building a new community here together, we're bound to find some sticking points. Those might be bugs, new features you need, things you need support with... whatever they are, the C...
I have heard the physicist Laurence Krauss claiming that he believes that the universe is flat. Okay, but if we take four astronomers and we put one in the north pole, one in the south pole, one i...
This depends, of course, on what you are trying to achieve with the model. Remember that a model is a simplification for purpose of analysis, because the full physics is either too complicated or ...
After 4 edits, it seems you are asking whether there are places in the universe where galaxies can form, but planets in those galaxies can't support life. It seems you want life to be impossible d...
You are somewhat misquoting what I said. It would help if you provide a link to the comments you are asking about, but the issue was most likely about lack of units on numeric values, not variable...
I was introduced to a somewhat novel derivation of the ideal gas law that starts by thinking about the number of microstates of an ideal gas, $\Omega$. Say we have a gas with a single particle in a...
Codidact's communities have a lot of great content that is helping people on the Internet. Our communities are small, though, and sustainable communities depend on having lots of active, engaged p...
The Rayleigh-Jeans law does a good job of describing the spectral radiance of a black body at low frequencies: $$B_{\nu}(T)=\frac{2kT\nu^2}{c^2}$$ with $T$ the temperature and $\nu$ the frequency...
I am not a marketer so my idea may not be good. As a physics enthusiast I can give some thoughts. Recently, I was just reading questions and answers in PSE just to learn new things. And what I h...
I was recently reading some questions here and there saying that "relativistic mass is outdated". I saw someone saying that "outdated" doesn't mean the concept is wrong. My question is what physici...
This looks like a typical halogen light bulb. They are: Extremely hot Very bright Very small The combination means that, until bright, efficient and affordable white LEDs came along (LEDs h...
Semi-holonomic constraints look something like the following: $$f(\mathbf{q},t)=\sum_{i=1}^nf_i(\mathbf{q},t)\dot{q}_i+f_0(\mathbf{q},t)=0$$ with the requirement that $f(\mathbf{q},t)$ be integra...
The light shines on everything in an unblocked direct line from the light source. This light is quite bright, so can be seen by human eyes all the way out to the horizon (until the curvature of th...
Imagine two equivalent (e.g. same frequency) photons colliding with each other head-on. The linear momentum of the system is $0$ because each photon's momentum has the same magnitude but is pointin...
No, this site is about physics, not chemistry. Whether something is on topic anywhere else has no bearing on it being on topic here. That said, there are some gray areas between physics and chemi...
The title is a framing for a theoretical question; I'm not asking for practical advice. A friend was recently in this situation and my attempts to apply what I remember of a couple semesters of co...
How do I deduce which setting suffices for mixing table salt + COLD tap water? Measure it. That really should have been obvious. My gut feel is that any reasonable agitation will work about equa...
Basic answer It depends on what you care about. If you're primary concern is to minimize injury to the people in your car, then hold the brake firmly in ordinary low speed cases. This minimizes ...
When we launched this community, we did not yet have the ability to set different reputation grants for different categories. We've had this for a while but we failed to follow up before now, sorr...
When a pendulum made of a conducting material moves through a magnetic field, it's a well-established fact that it experiences a retarding force, thus slowing it down, however, I'm unable to unders...
To understand this, it helps to look at a dimension less. Imagine, you're having a dispute with a flat-earther about whether the earth is a sphere or a flat plane. Moreover, there's a third person...
If we have a force which changes depending on the position of a particle, how can we find the position of the particle at some time $t$? We can find its velocity if it has travelled a given distan...
$$\sum_i F_i \cdot \delta r_i$$ is virtual work when internal force is $0$. For that reason, $$\sum_i F_i \cdot \delta r_i = 0$$ Here internal force stands for what? When a object's displacement ...
There are perhaps two questions here. The first is whether the planet is intrinsically dark, i.e. it reflects only a small fraction of the light that reaches it from the Sun and emits only a small ...
