In my physics textbook (“Physics fot Scientists and Engineers” by Serway and Jewett) it says that “the cause of changes in the rotational motion of an object about some axis is measured by a quantity called torque.” Where $\tau = F sin(\phi) r$. When $\phi$ equals $90$ degrees, $\tau = F r = (m r...

Hello and thank you for reading this (dumb) question. It is one of my semi-regular questions that is usually the result of me asking a question and not finding a satisfactory answer on google. From my "research" (cough: googling) I found that there have been efforts to make cars with jet engines ...

I know the one-way speed of light question has been exhausted, and I'm sorry for the naive question, but I would like to understand one thing. Can we measure the one-way speed of anything at all? If we "truly" can, why can't we synchronize that thing and an emission of light from one place to ano...

In the book, project Hail Mary, Eridians were not aware of relativity. It is claimed that, due to this, they calculated that they would need much more fuel than actually needed for interstellar travel. The reason being time dilation. I believe, this is missing an important aspect of relativistic ...