haruspex's latest activity
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haruspex replied to the thread Movement between two blocks.No, it's the maximum value of P before A slips on B if B were fixed. Since B can move, the max value may be greater. Just write down... -
haruspex replied to the thread Undergrad Logic Puzzle: The Locker Puzzle.The best strategy I can find gives them a mere one in ##^{100}C_{50}## chance, but at least that’s better than the ##2^{-100}## chance...
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haruspex reacted to julian's post in the thread Undergrad How to find the sum of this series? with
Like.
This is Euler's classic proof of the Basel problem that @.Scott was referring to in post #2. It appears in the book introduced by... -
haruspex replied to the thread Undergrad How to find the sum of this series?.I don’t know if it can be formalised, but I once stumbled on this: We know all the roots of sin(x), so write it as a factorised...
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haruspex replied to the thread High School Are we alone out there? The mystery of life in the Universe.As I indicated in post #22, the answer is predicated on those assumptions. What odds one ascribes to them is another matter.
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haruspex replied to the thread High School Are we alone out there? The mystery of life in the Universe.Not at all. I am suggesting that while microbial life only examples might be ten million times as common as advanced civilisations it...
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haruspex replied to the thread High School Are we alone out there? The mystery of life in the Universe.My basis is the string theory landscape of around ##10^500## equally possible universes. Amongst those, I feel sure b would vastly...
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haruspex replied to the thread High School Are we alone out there? The mystery of life in the Universe.True, but coupled with the anthropic principle it has the advantage of solving the "goldilocks universe" puzzle. I don't know why you...
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haruspex replied to the thread Undergrad Open problems in continued fractions.In each of those, starting with the first denominator, the terms on the left follow an arithmetic sequence while the numerators on the...
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haruspex replied to the thread High School Are we alone out there? The mystery of life in the Universe.I think you are overlooking the detection requirement. There may be vastly more places where there is just primordial life than...
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haruspex replied to the thread Undergrad Rod elastically impacting a ball - impact location.No, as I posted, you just need to assume the objects are arbitrarily rigid. That does not conflict with assuming the collision to be...
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haruspex replied to the thread Undergrad Rod elastically impacting a ball - impact location.True, but then we have to start worrying about friction and rotation of the ball, so we have to take the materials to be elastic but...
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haruspex reacted to putongren's post in the thread Rocket Launched Up When a Stone is Dropped Down with Like.
Total Distance = distance traveled by stone + distance traveled by rocket. Total Distance = h Distance traveled by stone = xstone =...
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haruspex replied to the thread Rocket Launched Up When a Stone is Dropped Down.Looks to me that @putongren has been consistent in using h for the cliff height.
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haruspex replied to the thread Inelastic collision: A package is dropped onto a moving sled.So why do you quote Relevant Equations: K=1/2 m v^2 ? (But you also need to assume the package does not slide off!)