Recent content by Johnls

Faraday's law talks about the change in the flux through a loop, but I never see how people take into account the change in the flux due to Faraday's law itself and I am wondering if that leads to a contradiction. For example when calculating the current through a physical loop with area A and...

I was about to say: "I can imagine that in my reference frame your ruler will be shorter and in your reference frame my ruler will be shorter." but then I realized that if I place a chalk on to top and bottom of each ruler the argument by symmetry makes perfect sense, because there should be...

Thanks for the response! By definition? I can Imagine length contraction in the y-axis without it violating any definitions. The link doesn't work for me.

By y I mean any perpendicular axis to the axis in which there is movement.

This is more or less what I meant. It is just non-intuitive for me that one can get such a large impact with a little bit of water...

I think I got it, but one more question- Suppose I have a vessel just like the one on the left, but the wide side is 1 km^3 wide and the thick side is a few mm thick, but the thick side is 10 km long. According to Pascal's principle, there might be such a tremendous pressure to the point that...

Thanks for the quick response! I forgot to mention that the cross sectional area of the bottom is the same in both cases. I understand how to derive that both forces are the same with Pascal's principle. What I don't understand is how can it be that if you try and calculate the pressure in a...

Suppose there are two vessels filled with water up to the same height: If I understand pascal's principle, the pressure in the bottom of both vessels should be the same. But the right one has more weight, so isn't the force on the bottom greater and therefore there is more pressure there?

Oh I see... Thanks!

First of all, thanks for the reply! Could you please expand a little bit on how torque can be viewed as a "couple"? How can I do this conversion? How does it relate to the Gyro example?

I'm talking here about this situation: The explanation which is usually given as to why there is a precession, is that the torque is perpendicular to the angular momentum and the angular momentum changes in the direction of the torque. A few things I don't understand about it: 1. The torque is...