haruspex's latest activity

I see no reason to doubt @BelieverOf143___ understands that. If the vector product rule can be used to prove the law of sines then...

I do not see how it was clear that the last equation in post #52 was wrong without doing the simplification. Maybe you are better at...

When given a task like this, you have to start with the definitions you are expected to work from. State the law of sines and the...

Obviously you had done those steps, so I expect you to post where you actually got to, not several equations back, making me redundantly...

Well, obviously, the usual steps of cancelling out the non-infinitesimal terms and discarding the second order infinitesimals. What...

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...

But that element is the "exhaust". The loss of it is removing momentum from the system. It is the water leaking from the cart.

Right, but it does affect this:

Yes. Right, but that's rocket+fuel+exhaust, which is a closed system. There are two issues here. First, somehow an element leaves the...

Ok, I understand now. You have fallen into the classic trap of applying ##F=\frac{d(mv)}{dt}=v\frac{dm}{dt}+m\frac{dv}{dt}## to a...

Are you writing multiple lines of LaTeX inside one pair of $ $ brackets? Try not doing that. And please use the preview button...

Please show the details of your differentiation of the horizontal momentum. Looks like you missed a term.

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...

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