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A 127-year-old physics riddle solved
Phys .Org ^
| 21 Aug 2019
| Norwegian University of Science and Technology
Posted on 08/22/2019 11:41:34 AM PDT by DUMBGRUNT
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To: LibWhacker
Indeed but Boat Wake Angles is a great name for a rock band.
41
posted on
08/22/2019 1:31:13 PM PDT
by
xp38
To: DUMBGRUNT
the v-shaped wake behind a boat should always be just below 39 degrees, as long as the water isn't too shallow. Sufficient shallowness of the water can make the wake disappear altogether.
42
posted on
08/22/2019 1:32:56 PM PDT
by
Pilsner
To: Jagermonster
hehehe... yes it would be... especially if the germans wanted it changed very quickly...
43
posted on
08/22/2019 1:41:14 PM PDT
by
teeman8r
(Armageddon won't be pretty, but it's not like it's the end of the world.)
To: MomwithHope
Sorry I forgot the "/s". /s
44
posted on
08/22/2019 1:44:28 PM PDT
by
BitWielder1
(I'd rather have Unequal Wealth than Equal Poverty.)
To: BitWielder1
I knew it was sarcasm, pix was a comment on the thread not you.
45
posted on
08/22/2019 1:46:23 PM PDT
by
MomwithHope
(Forever grateful to all our patriots, past, present and future)
To: rdl6989
46
posted on
08/22/2019 2:02:16 PM PDT
by
Blood of Tyrants
(Where does it say in the Constitution anyone is entitled to the property another has labored for?)
To: ProtectOurFreedom
Whatever floats your boat, Simen.
Being easily amused, this is fun for me!
47
posted on
08/22/2019 2:17:45 PM PDT
by
DUMBGRUNT
("The enemy has overrun us. We are blowing up everything. Vive la France!"Dien Bien Phu last message.)
To: bankwalker
If a chicken and a half lays an egg and a half in a day and a half, how many eggs will three chickens lay in thirty days?
48
posted on
08/22/2019 2:20:55 PM PDT
by
DUMBGRUNT
("The enemy has overrun us. We are blowing up everything. Vive la France!"Dien Bien Phu last message.)
To: IronJack
Kelvin wake pattern
Waterfowl and boats moving across the surface of water produce a wake pattern, first explained mathematically by Lord Kelvin and known today as the Kelvin wake pattern.[1]
This pattern consists of two wake lines that form the arms of a chevron, V, with the source of the wake at the vertex of the V. For sufficiently slow motion, each wake line is offset from the path of the wake source by around arcsin(1/3) = 19.47° and is made up of feathery wavelets angled at roughly 53° to the path.
The inside of the V (of total opening 39° as indicated above) is filled with transverse curved waves, each of which is an arc of a circle centered at a point lying on the path at a distance twice that of the arc to the wake source. This pattern is independent of the speed and size of the wake source over a significant range of values
https://en.wikipedia.org/wiki/Wake
49
posted on
08/22/2019 2:26:09 PM PDT
by
DUMBGRUNT
("The enemy has overrun us. We are blowing up everything. Vive la France!"Dien Bien Phu last message.)
To: Ouchthatonehurt
That one makes my brain hurt!
A quick glance, does not appear to be 39 degrees inside angle?
Perhaps some intrepid investigator will put a protracter to it?
50
posted on
08/22/2019 2:30:09 PM PDT
by
DUMBGRUNT
("The enemy has overrun us. We are blowing up everything. Vive la France!"Dien Bien Phu last message.)
To: DUMBGRUNT
"Boat wakes can actually have a completely different angle under certain circumstances, and can even be off-centered with respect to the direction of the boat." Guess I've got a major problem... My GPS wasn't working while I was storing some guns and ammo and was depending on lining up the boat wake with one of the pylons of the Chesapeake Bay Bridge when it came time to get them for the quarterly exercise and cleaning...
51
posted on
08/22/2019 2:40:03 PM PDT
by
SuperLuminal
(Where is Sam Adams now that we desperately need him)
To: DUMBGRUNT
That’s why I was never good at water skiing!!
52
posted on
08/22/2019 2:42:51 PM PDT
by
DannyTN
To: dfwgator
"How many licks does it take to get to the middle of a Tootsie Pop?" Yikes! Thought that that was going to be a joke for the ages, until disappointment set in when I read the last two words...
53
posted on
08/22/2019 2:45:31 PM PDT
by
SuperLuminal
(Where is Sam Adams now that we desperately need him)
To: chief lee runamok
I’ve watched a lot of nice afts.
54
posted on
08/22/2019 3:02:21 PM PDT
by
polymuser
(It's discouraging to think how many people are shocked by honesty and how few by deceit. Noel Coward)
To: Augie
PhD = Piled Higher and Deeper No wonder I can't get any post holes dug.
55
posted on
08/22/2019 3:04:35 PM PDT
by
depressed in 06
(60 in '20. Now, more than ever!)
To: DUMBGRUNT
“39 degrees, huh?”
56
posted on
08/22/2019 3:09:16 PM PDT
by
polymuser
(It's discouraging to think how many people are shocked by honesty and how few by deceit. Noel Coward)
To: DUMBGRUNT
so it has nothing to do with the bow angle or width...
57
posted on
08/22/2019 4:10:25 PM PDT
by
Chode
(Send bachelors, and come heavily armed!)
To: rightwingcrazy
At least they are being useless and not destructive as in the case of the climate scientists.
To: DUMBGRUNT
I looked it up too. I didn’t follow the explanation, but the angle seems to be independent of the vessel, its speed, and just about everything but the depth of the water and any incidental wave action.
59
posted on
08/22/2019 5:07:55 PM PDT
by
IronJack
To: TalBlack
and discovered that he didn’t know how a greenhouse works
Many important discoveries are unexpected results.
I’m sure Mr Musk is on this one looking for ways to improve his cars!
60
posted on
08/22/2019 5:20:33 PM PDT
by
DUMBGRUNT
("The enemy has overrun us. We are blowing up everything. Vive la France!"Dien Bien Phu last message.)
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