haruspex's latest activity
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haruspex replied to the thread Errors and significant figures.It depends what you mean by the uncertainty. In many contexts you want the statistical uncertainty, i.e. standard deviation. If X and Y... -
haruspex replied to the thread A cylinder connected to a hanging mass.The horizontal forces on it are the friction from the floor, the pull of the rope, and the normal force from the wall. The first two...
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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?
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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?
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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...
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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...
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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...
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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...
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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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