I'm confused by the derivation of the expression for time dilation as well as the concept itself. I've read multiple answers, textbooks, watched lectures, and they confused me further due to subtleties that are not fully explained. Here's what I know tho. Let $S'$ be an inertial frame moving with...

The law of decay is $$\frac{dN}{dt} = -\lambda N ,$$ where $\lambda$ is the decay constant. I read something about $\lambda$ but not really clear.... Someone told that is a probability, someone that is a constant that can be greater than one, and I am a lot confused. So, if it is the "probability...

Suppose a box of mass $m$ is thrown at angle $\theta$ with velocity $v$. At the topmost point,the box explodes into two identical smaller boxes. One of the boxes falls straight to the ground at that point. I have seen that conservation of momentum is used to calculate the velocity of other box af...