haruspex's latest activity
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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... -
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.
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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...
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haruspex replied to the thread Collision of a bullet on a rod-string system: query.ok, thanks for checking it all out.
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haruspex reacted to kuruman's post in the thread Collision of a bullet on a rod-string system: query with
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This problem is from the Indian National Physics Olympiad – 2020. A "tentative" solution appears here on page 15. -
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...
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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...
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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°...
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haruspex replied to the thread Will Y-Direction Motion Cease with X-Direction Acceleration Only?.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...
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haruspex replied to the thread Will Y-Direction Motion Cease with X-Direction Acceleration Only?.Ok, so it is the difference between a solution that satisfies a differential equation and one that corresponds to a physical process...
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haruspex replied to the thread Will Y-Direction Motion Cease with X-Direction Acceleration Only?.It's not based on a solution, merely the fact that an explicit equation like ##\dot\omega=\sqrt{b^2-\omega^4}## (positive square root...
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haruspex replied to the thread Will Y-Direction Motion Cease with X-Direction Acceleration Only?.Ok, I do see now how multiple solutions arise. At any instant, we have ##\dot\omega^2=b^2-\omega^4##, giving two solutions for...
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haruspex replied to the thread Collision of a bullet on a rod-string system: query.Angular momentum of a body relative to a reference point has, in principle, two components: the spin angular momentum (its angular...
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haruspex replied to the thread Collision of a bullet on a rod-string system: query.Yes, the point of attachment moves, but my reference point doesn't. Let’s say there is a mark on the table at P. That is my reference...
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haruspex replied to the thread Collision of a bullet on a rod-string system: query.I'll say it again: my reference point for the angular momentum calculation is fixed. It is the point in space where the attachment...
