Rog's Rag-bag
#1239073
01/19/21 10:27 AM
01/19/21 10:27 AM
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Joined: Nov 2004
Posts: 21,873 Bucks, England
Urban Worrier
OP
True Blue Boomer
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OP
True Blue Boomer
Joined: Nov 2004
Posts: 21,873
Bucks, England
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Maths, logic, trivia, puns, general silliness - an assortment of stuff too disparate to go under any other title. In other words, same old rubbish... -1. What number should replace the question mark and why? -2. Four people are seated waiting for their Covid vaccination. Mrs Brown is next to Mrs Green but not next to Mr Jones. Mr Jones is not next to Mr Gill. Who is next to Mr Gill? -3. What is the next number in the following sequence?: 212 223 242 526 272 829 -4. “As a kid I was made to walk the plank. We couldn’t afford - ---". -5. A ball is dropped to the ground from a height of 10 feet. It then bounces back up to half its original height and falls back. It repeats this, always bouncing up half of the previous height. If the ball bounces an infinite number of times before coming to rest, how far does it travel? -6. “I've just seen a documentary on how ships are held together. R-------!” -7. A rebus: PERSON PERSONS PERSONS PERSONS -8. The late Phil Spector made his debut in the pop world in 1958 as part of which vocal trio? -9. What musical term is indicates a chord where the notes are played one after another rather than all together? -10. This is a (disguised) still from the end of which film?
Last edited by Urban Worrier; 01/20/21 09:50 AM.
To waste one second of one's life is a betrayal of one's self. I wonder what's on television...?
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Re: Rog's Rag-bag
[Re: Urban Worrier]
#1239091
01/19/21 01:57 PM
01/19/21 01:57 PM
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Joined: Aug 2000
Posts: 52,970 Upstate NY
Pandora
Sonic Boomer
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Sonic Boomer
Joined: Aug 2000
Posts: 52,970
Upstate NY
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Ok, Rog, I figured that if the ball stays within 10 feet, that's the distance traveled. But you want the distance traveled within that 10 feet so the answer is infinity because the bounces will never stop.
10 +5+5 +2.5+2.5+1.25 +.....
Netflix needs to stop asking if I'm still watching and start asking if I've switched the laundry over yet
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Re: Rog's Rag-bag
[Re: Urban Worrier]
#1239096
01/19/21 05:06 PM
01/19/21 05:06 PM
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Joined: Nov 2004
Posts: 21,873 Bucks, England
Urban Worrier
OP
True Blue Boomer
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OP
True Blue Boomer
Joined: Nov 2004
Posts: 21,873
Bucks, England
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You got it, oldbroad! That's it, Sue. It's made up of two series, one going 10, 5, 2.5... (the "downs") and the other going 5, 2.5, 1.25... (the "ups"). I think there is a mathamatical formula (which I can't remember!) that gives you the total distance after an infinite number of bounces, but if you add them up by hand for the first 5 or 6 bounces (and maybe plot them on squared paper) you should get a good idea of what they'll finish up at...
To waste one second of one's life is a betrayal of one's self. I wonder what's on television...?
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Re: Rog's Rag-bag
[Re: Urban Worrier]
#1239101
01/19/21 06:44 PM
01/19/21 06:44 PM
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Joined: Aug 2000
Posts: 52,970 Upstate NY
Pandora
Sonic Boomer
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Sonic Boomer
Joined: Aug 2000
Posts: 52,970
Upstate NY
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I made the mistake of looking for the formula. There IS one because what's been proven is:
"Mathematically, we have to use the fact that (for some cases) the sum of an infinite number of terms is a finite number."
a = initial height of drop = 10 r = percentage of bounce back (1/2)
2(a/1-r) - a 2(10/.5) - 10 2(20) - 10 30
Another site suggests the 50% bounce back doesn't stay consistent. Their formula is more daunting.
Netflix needs to stop asking if I'm still watching and start asking if I've switched the laundry over yet
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