All Questions

The original question is: A sled is pushed along a snowy road with velocity $v = 2.5\,\mathrm{m/s}$. When it is released, it glides along for $6.4\,\mathrm m$ before coming to rest. Find the ...

In the Feynman lectures, it is stated Also, I should say that $S$ is not really called the ‘action’ by the most precise and pedantic people. It is called ‘Hamilton´s first principal function.’ Now ...

If I push one end of a spring (while the other end is attached to a rigid support) with a force of F and over a distance of $x = F/k$, it is only after a the end of the spring has been displaced x ...

https://skepticalscience.com/skakun-co2-temp-lag.html?fbclid=IwAR2A_wvpTcWfdMjZsY_64JELzKt592FpXX8Q1UtIopgvoq3t8TqaThBGyxc So while CO2 did lag behind a small initial temperature change (which mostly ...

An object A of mass 2kg is moving with a velocity of 3m/s and collides head on with an object B of mass 1kg moving in opposite direction with a velocity of 4kg . After collision they stick together. ...

Consider a real scalar $\phi(x,t)$ with mass $m$ in $1+1$ dimensional spacetime, described by the 2d free Klein-Gordon action. $\phi(x,t)$ lives on an interval $0 \leq x \leq L$, and is subject to ...

Does stripping the electrons off of hydrogen atoms affect it's boiling point in any way?

While going through my physics book, I got over a question which ask us to plot a position-time graph for the interval ($t=0\,\mathrm s$ to $t=5\,\mathrm s$) From the top of a tower, a ball is ...

This section is from the Openstax University Physics: Volume 1 online textbook. In physics, work is done on an object when energy is transferred to the object. In other words, work is done when a ...

Lightning is supposed to have killed 322 reindeer within an area that's about 50-80 meters in diameter on a mountain plateau in Norway. Nearly the entire herd died. Sources: (1, 2, 3, 4) Photo: ...

While working on an alternative cosmological paradigm of, Eigen-rotational Clusters of String-matter Universe, it was hypothesized that the fundamental matter is, Eigen-rotational elastic string-...

I want sites and books to teach physics and chemistry, at the university how do I get that.?

I remember reading that the outer orbitals of atom have higher energy. If an electron is given enough energy is goes to higher energy orbitals from $n=1$ to $n=2,3,4...$ My question is that why do ...

Here's the textbook question: Twelve wires of equal length 'l' are connected to form a skeleton cube which moves with constant velocity v perpendicular to the magnetic field B. What will be the ...

I was thinking one day about how a speed, or perhaps the acceleration, of a person riding a zip line could be calculated. I first started by thinking of an ellipse where the two foci were the anchors ...

Based on the fact that batteries have some kind of internal resistance, if I had a circuit that consisted of a battery and a resistor of some kind would they act like a potential (voltage) divider? ...

I understand the symmetry structure of the 3D isotropic harmonic oscillator $H = \frac{\mathbf{P}^2}{2\mu} + \frac{1}{2}m\omega^2\mathbf{X}^2$ as follows. The energy levels are $E_N = \hslash \omega (...

So, I solved a question about acceleration in polar coordinates, but most people in my class (Classical Physics, first year at university studying Physics) disagree with my answer. So the question is ...

When I tried to answer the SE question, Clock on a pendulum, I faced an ambiguity regarding time dilation in the gravitational field. To make the argument clearer, I designed the simpler thought ...

I run into a question which haunts me for a while. Can anyone help me out? The problem is: Consider the effusion of molecules through an opening of diameter d in the walls of a container with ...

I was reading this and in there it states that The weakness of the wave theory was that light waves, like sound waves, would need a medium for transmission. The existence of the hypothetical ...

First I have the definition of a conformal map. Let $(M,g)$ and $(M',g')$ be two pseudo-Riemannian manifolds of same dimension. Let $U\subset M$ and $V\subset M'$, we say that a smooth map of maximal ...

How can I plot a vector in a different system than the Cartesian system? Suppose I have a vector i cylindrical coordinates: $$a_{\phi} (\phi) = \cos(\phi)\tag{1}$$ On the other hand, I have a ...

Trying to understand the 2 formulas and the relations between radius. Common sence will tell me that centrifugal force increases while we are on a curve with a short angle , as newtons law formula ...

Recalling the equation on the ponderomotive force experienced by a particle in a non-uniform oscillating electric field: 𝐹=𝑞^2/4𝑚𝜔^2 grad(𝐸2), Could anyone shed light on what frequency range 𝜔 ...

If so what is it?, why? is the the answer to why scalable to Helium?

I remmember that exists a demostration of this time is actually infinite, but I cannot find it. We have a potential V(x) that it had a local max, and a local min at least. If we give to a particle ...

I can find 3 displacement $\vec d_1 ,\vec d_2, \vec d_3$ and use them as basis so that a displacement is $\vec d=a\vec d_1 +b\vec d_2+c \vec d_3$. I can find 3 forces $\vec F_1 ,\vec F_2, \vec F_3$ ...

In the past couple of weeks I’ve re-watched Sidney Coleman’s wonderful 1994 lecture “Quantum Mechanics” in Your Face” and Sean Carroll’s 2019 Google talk “Something Deeply Hidden: Quantum Worlds & ...

I was reading about how to find the buoyancy force when I came across this explanation: Imagine a box submerged in a tank of liquid. The distance from the surface of the liquid to the bottom ...

Would it be true to say a person is less massive on the surface of the Earth than they are in space because they have less potential energy? Would the Earth also be reduced in mass slightly?

I have a question that i cant figure it out. I would be so pleasent if you can help me.

Would bombarding ionized hydrogen gas with neutron radiation cause cold fusion as the neutrons have no electrostatic repulsion to overcome therefore making it much easier to get within range of the ...

suppose a horizontal plate capacitor. They are separated by $d=0.005 \text{m}$. In a homogeneous field, the oil droplet ($m=3\cdot 10^{-15} \text{ kg}$) sits at the bottom of the lower plate. Like a ...

While learning wave-particle duality of an electron I found the wave with which we associate the electron is the probability wave. Now my questions are that if that is so How do electron show ...

I'm going to begin with a prelude about constructing the solution using the action/Lagrangian formalism in order to provide context and a point of comparison for the canonical one. The main question ...

there was a question in which the object is place right side of a concave lens so I decided as usual like taking objects position as positive and considering the right face of the concave mirror so I ...

I am trying to calculate the optimal RPM of a DC motor in order to move a car. I know that the force exerted on the wheel by the motor is: $$ F=9N $$ I also know the following information ("h" ...

Take a typical science lab diffraction grating which is producing a pattern on a screen. Let's consider the location of say the first maximum on the right side. Let's draw straight lines from the ...

I am trying to derive the equation for the rate of change of the energy for a relativistic electron. I know I should start from the following equation: $$\frac{d(\gamma m\vec{v})}{dt}=-e(\vec{E}+\vec{...

Consider two balls (starting at zero speed) rolling down under the force of gravity inside conducting copper (non- magnetic material) tubes; the red ball is magnet and blue is not. a. Are current ...

I do a lot of fibrework (carding wool, spinning yarn, weaving, etc.) and I've noticed a funny behaviour that anything long and flexible, which can withstand significant torque exhibits. If I take a ...

How can I make a “further interpretation” of the 2nd term of system kinetic energy when it comes to “fluids”? (Possibly deformable body, too) Linked pdf below is not lecture note of mine, however, my ...

A boy and his atom is a short movie by IBM animated by actually moving atoms around and using a scanning tunneling microscope to display the result. When I first saw this picture I was fascinated ...

Folks, Apologies for this question, A supernova has a KE of 10^30 J and it is powered entirely from 56Ni decay. How much 56Ni is needed? I was looking for pointers in what formula is us or how to ...

I am learning fluid dynamics for my math graduation , and as such don't have a physics background for this subject . I came across the following question following question : Part 1 : A sphere of ...

In a previous question, I noted that if you have a charge distribution with nonzero charge, then it is possible to choose an origin (at the centre of charge) which makes its dipole moment vanish, and ...

I did general relativity years ago at Uni and was just revising with the aid of Dirac''s brilliant book; the beauty of this book is that it is so thin and concise. On reading this book I find that I ...

It is difficult for me to understand how beta decay releases energy. The neutron is more massive than a proton, electron and antineutrino combined. Would this not imply that energy is being ...

While reading a book about interactions I've come to this paragraph: In the Schrodinger representation, the state function satisfies the equation $$\mathrm{i}\frac{\partial}{\partial t}\phi(t,x)=H\...