PeroK's latest activity

What you need is a Photo(n)multiplier: https://en.wikipedia.org/wiki/Photomultiplier_tube

Let's take that as your argument that physics generally is no good. So, what do we do? Get out the new-age crystals? Rely on ancient...

##u=x^2+\pi +1##

You have $$a = v \frac{dv}{dx}$$ where ##x## is the displacement. As the block initially moves to the right, you have ##x=s##, so the...

it is not simple harmonic motion

The question is a bit odd. Presumably, the bar does not get lifted off the surface, so that we have an assumed constraint of motion in...

A common misunderstanding, but it was never trained to be correct or consistent. It was trained to be similarly satisfying as its...

Define "exists". Show me the future if it "exists". Tell me what happens tomorrow if it "already exists". You are just playing with...

There's nothing inherent in the theory of relativity that pertains to freewill. Freewill could be described as a measure of our ability...

Actually, I'll ask that this thread is moved to homework. Just post your working on this thread.

There's an Introductory Physics Homework section. It has a template.

I guess you eventually need to express ##a_1## as a function of ##m_1, m_2, \alpha## and ##g##?

You could post this under homework. I looked more closely and those diagrams and it's a little complicated. Three suggestions: 1) You...

I didn't think there were any elementary experiments that tested GR. As distinct from Newtonian gravity. Pound-Rebka or Hafele-Keating...

:welcome: Physical constraints are usually based on a physical understanding of the problem. In general, we have to figure out how to...