PeroK's latest activity

A bike is a complicated machine. As the pedals speed up, it becomes harder to maintain the force. Without changing gear, you end up...

There are a lot of people who think that applied force remains constant as speed increases. They see applied force as the fundamental...

Consider an object falling in vacuum under a constant gravitational force. The rate that kinetic energy is gained by the object...

The following formulas are useful. Try to get them by yourself. Suppose we have a curve ##\boldsymbol r=\boldsymbol r(s).## And let a a...

The way I would look at it, he actually gets equation 1.13 from 1.14 (using Taylor expansions). I.e.: $$\kappa^{-1} \sin(\kappa s) =...

Thank you, that’s very helpful and completely fair. Coming from a systems-thinking background, I’m very aware that real understanding...

:welcome: Generally, it's very difficult to follow developments in theoretical physics without being able to solve at least advanced...

I don't think you have to make any substitutions. In general, if: $$f(t) = \frac{d}{dt}g(t)$$Then, by the fundamental theorem of...

Absolutely true. But we do not think and experience life in equations. There is an 'arrow' of causality as there is an arrow of time...

It's worth noting that this is an over simplification, one which contributes to the confusion around black holes (IMO) by providing a...

When do I start relearning all the physics I know? It's true I took some physics as part of my mathematics degree back in the early...

I agree with you partially, if a person is fully self taught then they are 100% going to have to relearn what they taught themselves but...

There's definitely truth to this: using textbooks (and these days, a little bit of the internet) to teach yourself everything does have...

I just came across a post in another thread, “Some thoughts about self-education“, where gleem wrote the following: “Sometimes, after...

To determine the direction of the gravitational field, also known as "down", you suspend a mass from a string and you deduce that "down"...