haruspex's latest activity

Did you see post #13?

Ok, here’s what is wrong with the AI solution. First, "the CM acceleration is ##(R-r)\ddot\theta##, not ##a##” is wrong in that it is...

I have confirmed your result independently. Will try to locate the error in the AI solution, but rightnowI am a passenger on a very...

The OP's analysis appears to be independent of the point in the cycle (other than assuming a nonzero magnitude for the frictional force).

No, that is only an approximation for small displacements. But you don’t use it in what you posted, and the question as you have...

That it is at a known distance from every charge, no matter how those charges are distributed around the two shells. This means we can...

No, that clearly would not be true. But the charge on the inner shell will rearrange so that the potential is the same everywhere on...

For future reference: Please provide the full statement of the problem exactly as given to you including any diagrams. If the answer is...

Good, but do you now see how to get that answer?

From the perspective of the physics, the key is that the device needs to exert a certain impulse without exceeding some threshold force...

But that cannot apply here since it would provide no way to judge distances. Without goggles, a real eye cannot focus because the lens...

It’s possible that there is a mistake with the question’s wording (Post #1) and a mistake in the diagram (Post #9). If the viewer's eye...

The other cords are not attached to the weight. Each body only "knows" about the forces that act directly on it. The suspended body is...

So what does that tell you about the net force acting on it? And what forces contribute to that total?

What forces act on the suspended object? Is the suspended object accelerating? The "relevant equations" item in the template is for...