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haruspex's latest activity
haruspex
replied to the thread
Physics Problem on Tension in Water
.
Yes, except that, as I wrote, the force is not constant. What you have calculated is the average. Is that what you are asked for?
Tuesday, 4:03 AM
haruspex
replied to the thread
Physics Problem on Tension in Water
.
Ok, so can you do what I suggested in post #8? Do I need to explain more?
Tuesday, 1:45 AM
haruspex
replied to the thread
Physics Problem on Tension in Water
.
I agree that is confusing, but since the question asks for a tension there was, presumably, some mention of a rope in the original text...
Monday, 7:01 PM
haruspex
replied to the thread
Physics Problem on Tension in Water
.
Yes, I think we all read it that way. @jbriggs444's point is that we have no info re the surface area of the reservoir, other than that...
Monday, 6:59 PM
haruspex
replied to the thread
Physics Problem on Tension in Water
.
You just have to draw the before and after pictures. You can consider the water as having gone from the volume that is occupied in the...
Monday, 4:31 AM
haruspex
replied to the thread
Physics Problem on Tension in Water
.
Yes, but I am giving you another way to figure this out that's clearer. I asked how much water disappears from the top if the cylinder...
Monday, 2:37 AM
haruspex
replied to the thread
Physics Problem on Tension in Water
.
Yes, but sketch where that water has come from. And where it has gone to. What is the change in PE? Btw, the force will not be constant.
Monday, 2:21 AM
haruspex
replied to the thread
Physics Problem on Tension in Water
.
You might find it clearest to think in terms of energy. If the cylinder descends a distance ##\Delta y##, what is the change in PE...
Monday, 1:41 AM
haruspex
replied to the thread
Collision of a bullet on a rod-string system: query
.
ok, thanks for checking it all out.
Sunday, 6:38 AM
haruspex
reacted to
kuruman's post
in the thread
Collision of a bullet on a rod-string system: query
with
Like
.
This problem is from the Indian National Physics Olympiad – 2020. A "tentative" solution appears here on page 15.
Sunday, 1:16 AM
haruspex
replied to the thread
Collision of a bullet on a rod-string system: query
.
The answer looks rather different. Strange that theta does not appear in the final equation for T. This is troubling: "1. Angular...
Sunday, 1:16 AM
haruspex
replied to the thread
Toboggan on circular arcs
.
I see no benefit in introducing V. You are to find a range of values for U First, identify the points of the trajectory which will...
Saturday, 4:11 PM
haruspex
replied to the thread
Toboggan on circular arcs
.
Correctly, the analysis considers the highest risk of losing contact is at A and B. F=ma is being applied along the normal, so at 45°...
Saturday, 3:50 PM
haruspex
replied to the thread
Motion in 2 dimensions
.
Yes, as I wrote in post #21, you can (only) elect to switch the sign of the tangential acceleration arbitrarily, but if you choose not...
Aug 29, 2025
haruspex
replied to the thread
Motion in 2 dimensions
.
Ok, so it is the difference between a solution that satisfies a differential equation and one that corresponds to a physical process...
Aug 29, 2025
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