haruspex's latest activity

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...

I feel it’s more likely a lack of peer review. A committee might have done better.

When writing "ln(x)” in LaTeX, you can make it clearer with "\ln": ##\ln(x)## v. ##ln(x)##. This avoids confusion when ##l## or ##n##...

It's intriguing that two authoritative-looking sources provide different answers. Maybe somebody at oswaal360 realised the CBSE answer...

I must be misinterpreting what you are saying. As I read the above, you are saying that if in one frame they are both moving at...

I do not understand. If they move with the same velocity in one frame they must move at the same velocity in all frames. Besides, the...

I'd forgotten this puzzled me in the past: whether there is a magnetic field from a current must depend on the frame of reference...

Well, it doesn’t say the moth is flying directly towards the bat. Perhaps it was supposed to tell you it was flying at an angle of 60°...