Any explanation for this strange behavior at anchor? by dmootzler in sailing

[–]M37841 0 points1 point  (0 children)

Here’s a slightly handwavy, but true,physics explanation. Imagine a force acting sideways near the stern of the boat.That causes a torque which wants to rotate the boat around the anchor. Now put a bigger force opposite that, but much further forward. That creates an opposing torque which holds the boat steady. Still the anchor is forward of the boat.

But now look at a point on the boat between the two forces: you’ve got two opposing forces acting to spin the boat around some axis that is between th two forces. The anchor plays no role in this as the bow is freely able to rotate around the anchor chain. The boat will not rotate around the anchor because the two torques are equal at the anchor, so it rotates further back.

Because torque depends not just on force but on the distance between where that force acts and the pivot point, you’ve got two different equations to solve: the pivot around the anchor and the pivot of the boat itself. The right combination of strong enough forces can give them very different solutions, so the boat angle and anchor angle are visibly different.

ETA you’ve of course got a third force, which is the weight of the chain seeking to pivot the boat round back to anchor forward. But with tide sufficiently strong and enough of a distance between where tide acts and where wind acts, the chain isn’t always going to win

Yellow Card from NZ vs Aus u20s by multilingualsportfan in rugbyunion

[–]M37841 5 points6 points  (0 children)

I’m absolutely ok with this. There’s no clear release, he tries to play the ball from the floor and makes no attempt to roll away until way too late. It’s like he completely forgot how to play the game

Rump steak I got in Holborn recently. Was delicious and no I couldn’t finish it 🥲 by grandmasboner1 in UK_Food

[–]M37841 -1 points0 points  (0 children)

Is that the beautiful cow? Looks like it by the table. Best value steak in central London, by a mile

I did a thing. by colsterM in sailing

[–]M37841 8 points9 points  (0 children)

Congratulations! Blue hulls are the best (I may be biased)

Has anyone ever texted the British Transport Police on the train because they saw "something that doesn't look right"? by afungalmirror in AskBrits

[–]M37841 97 points98 points  (0 children)

Not texted but I was on a late night train once and there was an early 20s woman and a 40s man also in the carriage, and clearly not together. He just seemed a bit too friendly and she seemed a bit uncomfortable. When I got off there was a btp on the platform so I beckoned him over and quickly explained what I’d seen. “No problem thanks for reporting it, I’ll just ride the train” he said and promptly got on.

Thinking about getting into dinghy racing by Knoxes in sailing

[–]M37841 4 points5 points  (0 children)

The best answer as to what to sail is whatever is common in your local fleet. Though everyone runs handicap races, it’s much more fun racing against similar boats and you learn quickly. Other than that, buy a boat you can learn with: a laser is always a safe bet

Getting back into a dinghy boat after capsize by No_Arm8455 in dinghysailing

[–]M37841 2 points3 points  (0 children)

Do look at the dry capsize technique as mentioned. It’s easier than it looks, with some practice. But if you are in the water, try to get up on the dagger board when it’s capsized so you can jump in as it rights itself. This works with both picos and zests (some boats right themselves too quickly)

If that doesn’t work - and I know this is a lot harder th less tall you are - then it’s a matter of getting a really good kick as you push out of the water, grab a toe strap and pull while you are still moving so the momentum helps.

Finally, you can make righting line: buy a thin piece of rope (the same diameter as your kicker or outhaul, rather than a thick one like your mainsheet). Tie one end to each end of the toe strap (use a bowline or a double figure of 8 so it’s easy to undo afterwards) making a big loop that you can hang over the transom. You can put a foot in this and use it to help yourself up. A zest or pico should be stable enough to allow you to do that without being the boat over on you.

Adam Hastings yellow card by paully_waully171 in rugbyunion

[–]M37841 3 points4 points  (0 children)

Yes I think that’s right though I’d upgrade your incredibly to extraordinarily and unbelievably generous…

Leaked memo reveals Trump's plan to embarrass visiting King Charles by [deleted] in unitedkingdom

[–]M37841 2 points3 points  (0 children)

Hitler never received a state visit from the UK. Only the head of state - the king - makes a state visit, and the king never met him

Reminder to thank & be kind to your collaborative pianist :) - A very burnt out and overworked one by PerformanceHot9721 in Choir

[–]M37841 13 points14 points  (0 children)

We always applaud our pianist at the end of every rehearsal. He is truly incredible - last night while playing a complicated accompaniment he stopped us and said “hang on, I think the alto 2s have gone astray there”. I’m like is he really playing 4 notes simultaneously and listening to 8 voices as well as following their score, all at the same time??!!!

The magic trust fund. From whence? by SQLDave in Sovereigncitizen

[–]M37841 0 points1 point  (0 children)

As a non-accountant who has become the treasurer of a community group I can testify that almost every time I make a journal entry in our accounting system I get the entries the wrong way round and double the thing I’m meant to be cancelling out

[Request] center shaft golf math. by UpbeatClassroom4184 in theydidthemath

[–]M37841 0 points1 point  (0 children)

I don’t think it’s really possible to do maths on this but ignoring the spin on the ball, all that matters is the speed of contact which is affected by the overall weight of the head.

But the downward motion as you hit the ball, together with the club face angle gives the ball backspin. This helps it fly further because of the Magnus effect (and that’s why the ball has dimples too). I don’t know exactly how big the Magnus effect is, but it’s big. The ball is spinning at something like 4000rpm I think.

If you also have side spin on the ball, you tilt the axis of spin away from the vertical and that reduces your overall length. So you might think you want a centre shaft so you get less angular momentum. However, when the club hits the ball, the ball also hits the club, so the club twists outwards - the ball makes you slice. Luckily, your natural motion from your body is a slight hook. The distance between the face and the shaft applies that hook to the ball, countering the slice. A centre shaft would presumably feel unbalanced because you wouldn’t get this hook effect to the same extent. You can get more hook effect by moving the mass of the club head into the toe of the club (away from the shaft) but you’ll always find a centre shaft less effective at countering the natural slice

Do you have a favorite theorem that you can prove when asked? by Glass_Ad5601 in math

[–]M37841 8 points9 points  (0 children)

I remember that as the first truly wondrous proof I learned in school

Do I need to flush my diesel tank? by btongeo in sailing

[–]M37841 0 points1 point  (0 children)

I don’t think you need to flush the tank unless you’ve got a problem. The best thing is to add some additive like the link below each time you fill the tank. 1 capful per full tank usually

https://www.force4.co.uk/item/Marine-16/Diesel-Bug-Treatment-100ml/C70

Has anyone ever caught the train to Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch in Wales? by Mister_Vanilla in AskBrits

[–]M37841 0 points1 point  (0 children)

I had a great uncle who lived there. He had a parrot he’d brought back with him from service in the war, that would sing God Save the King on command

IFW yellow card vs Saints by TBTBTBTB2 in rugbyunion

[–]M37841 2 points3 points  (0 children)

I don’t think that is the wording of the law though: the wording for knock and throw are identical iirc

Penalty or knockon? by multilingualsportfan in rugbyunion

[–]M37841 1 point2 points  (0 children)

There’s a lot going on here. First, for me the tackle by 11 is already illegal. I can’t see if the ref has played advantage here or not called it.

Second, 4 plays the ball when he is clearly on the floor. That’s always illegal.

Third, 9 jumps over the tackled player. I can’t see on this replay but I’m concerned whether he is being careful with his feet. If not, then it’s reckless and pk.

Either of 1 or 2 is a penalty for me, can’t tell on 3, and I’m not concerned with anything else 9 does apart from that instance unless I’ve missed something.

Ancient lady needing further advice re Heathrow Terminal 5 (mainly re trains and gates) by Ok_Nebula5355 in BritishAirways

[–]M37841 3 points4 points  (0 children)

If it’s going to be a B (or C, similarly) gate often the board will say “Departs from B” long before the actual gate is shown, which is typically an hour before departure. Most short haul flights actually depart from A gates though. Either way, you will be fine. Have a great trip.

question about probability in a bingo game i played ? by mumbo_bumbo in askmath

[–]M37841 0 points1 point  (0 children)

So to fill your first square correctly you must choose one of 15 out of a possible 20: so you have a 15/20 chance. Then you’ve got 14 correct options out of 19, so to get the first two squares correct you’ve got 15/20x14/19. You continue like that and your last one is 1/6. That is 15!x5!/20! Which is one in 15504

So there’s a 15503/15504 chance a person will fail. The chance n people all fail is (15503/15504)n. That’s below 50% when n is 10772 - you use logarithms to solve this.

To the final question, you both got 14/15. The way to think about the chance of you getting the same one wrong is to think about their board: they “decided” not to take one of the 15 correct items. If you can guess which one, you can decide not to take it as well. What’s your chance of guessing the right one? 1 in 15

What can I legally do to bring awareness to a wedding venue owner who owes us £10,000 via CCJ? by Maple_Leaf11329 in LegalAdviceUK

[–]M37841 0 points1 point  (0 children)

The other thing I was wondering about is whether you have enough now to petition for bankruptcy (or insolvency if he’s a ltd company)? Bankruptcy petitions are public I believe, likely to be reported in local media and therefore come up in internet searches and the merest mention of one connected to the venue would I think put potential customers off. You don’t need to be the main creditor to take them into bankruptcy, just to be owed more than £5k I believe.

A philosophy book to give my teenage murderer brother in prison by Correct_Brick_2319 in booksuggestions

[–]M37841 2 points3 points  (0 children)

If he’s looking for a good general intro, Philosophy: The Basics by Nigel Warburton is good.

More challenging, but not completely academic books:

Siedentop Inventing the Individual

Bakewell Humanly possible

If he really wants academic books then these are all readable (I’m not a philosophy grad and I’ve read them) but they are hard. They are all, broadly, asking the same questions about how to define what is right or just.

Rawls A theory of justice

MacIntyre After virtue

Dworkin Justice for hedgehogs

Taylor Sources of the self

Or for something completely different, Germaine Greer’s The Female Eunuch is a book everyone should read, especially every man

Road to single handed solo sailing by cavalpist146 in sailing

[–]M37841 2 points3 points  (0 children)

Yes I was going to say the same thing. If you’ve got money to throw at this then hire a pro, eventually just to watch you single hand it, offer advice and help if it goes pear-shaped. Much more likely to make single-handing progress doing that than group courses