jbriggs444's latest activity

They just haven't been exposed to an orthogonal instruction set...

As the skater's hands are pulled in, they trace out a spiral trajectory. A purely radial force has a non-zero component along the...

I disagree. The equations are about correlation, not causation. It is attractive to imagine ourselves in the driver's seat "causing"...

This intuition is a non-starter. Energy depends on reference frame. Causality (to the extent that we have a viable definition to go on)...

The claim that ##\vec F_\text{ext}## is given by ##\lambda hg(-\hat j) + \lambda \frac {\Delta x}{\Delta t}v \hat j## is clearly...

I agree completely. The chain traverses a one dimensional fixed path. There is no net force nor freedom to move other than along the...

I alluded to that in post #44, but I think it is ok because we can instead view it in terms a tension transmitted around the curve and...

It could if, for instance, we let the chain ride in a frictionless tube on the table. Then the section of chain in the tube would be...

Since the problem statement does not specify what happens to the chain on reaching the table we have to make a reasonable guess about...

That's nearer to what I would say. But, if someone wants to say pushing a wall and the wall pushing back is cause and effect, then I'm...

Correlation is not the same as causation. I would say that it is possible for some state of affairs to "cause" a Newton's third law...

I had considered offering this as a supposed equivalence. But it is not quite right. The portions of the chain that are falling through...

Chains buckle under compression. Like cables, ropes, cords, strings and threads. The intent of the problem is clearly that the chain...

PS note that it is the speed of light that is independent of the motion of the source. Not the velocity of light, which is a vector and...

Whether it’s a track over a smooth shoulder or a massless pulley is clearly independent of whether the problem concerns a massless...