haruspex's latest activity

No, as I posted, you just need to assume the objects are arbitrarily rigid. That does not conflict with assuming the collision to be...

True, but then we have to start worrying about friction and rotation of the ball, so we have to take the materials to be elastic but...

Total Distance = distance traveled by stone + distance traveled by rocket. Total Distance = h Distance traveled by stone = xstone =...

Looks to me that @putongren has been consistent in using h for the cliff height.

So why do you quote Relevant Equations: K=1/2 m v^2 ? (But you also need to assume the package does not slide off!)

First, let’s tidy the question up. The impact is given as elastic. The impact takes some time. The force the two bodies exert on each...

I read post #8 before I posted on the thread. The point of post #49 is to show that that starting value produces a lower bound. Post...

Yes, yes, I know all of that as you do. But I have come across people who have read the oversimplified "heat flows from a hotter body...

I did not understand that bit. What is a "radiant temperature"? Isn’t that anything above absolute zero? And do you mean more heat or...

Who are "they" here? Google "second law heat flow" and you will find plenty of apparently authoritative sources that say such as "heat...

No, post #8 observed that it gave the fastest convergence seen. My posts on this thread are all primarily concerned with bounds. These...

That’s not what I suggested. If you take all the "horizontal" resistors (I am taking the ladder to be horizontal, as in post #1, so the...

A lower bound for the resistance in the infinite case. The OP's original way of starting with a finite ladder, taking all vertical...

That gives an upper bound. Since the horizontal resistances are so small beyond n=20, how about taking them as zero, giving an initial...

Yes, I only discussed radiation. So what is the full expression for the rate of loss of heat at the air surface…...