According to this recent article [1], Earth spins faster now than in the past, switching its trend. Besides the main focus of the above-mentioned article, what captured my attention was the knowledge of the day's length 1.4 billions years ago. How were scientists able to measure it? [1] https://...

We know that,in rolling without slipping,the point of the disc of radius $r$ which is in contact with ground,has two velocities acting on it. One is the linear velocity of center of mass $v_{\mathrm{CM}}$. The other is the tangential velocity $\omega r$. The two act in the opposite direction and ...

I don't understand why if we add the two energies $\,\boxed{1}\,$ and $\,\boxed{2}\,$ from 2 electric fields the component $\,\boxed{3}\,$ is added and so it's different from their sum \begin{equation} E=\int\tfrac12\epsilon_0\left(\mathbf E_1+\mathbf E_2\right)^2\mathrm dV=\underbrace{\int\tfrac...

On July the 29th 2022, the Earth finished its rotation about 1.5 milliseconds earlier than the entire 24 hours. Scientists link this to climate change, saying that a possible reason could be due to the melting of polar glaciers. I do not know for sure what dictates this would happen, but what cam...

I am struggling to wrap my head around Faraday's law: $$\oint\mathbf{E}\cdot d\mathbf{l} =-\frac{d\Phi}{dt} = -\frac{d}{dt}\int_S\mathbf{B}\cdot d\mathbf{S}$$ Integral of an Electric field dotted with $d\mathbf{l}$ gives the value of the potential, but the work done across a closed loop should ...