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Edited by Webmaster on 16/05/2008 at 14:24
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One for Number Cruncher, I think! Sat an exam today which asked for a definition of the centre of gravity. The question is exactly (word perfect) as follows:
"The centre of gravity of a body is that point:
A. Through which the sum of the forces of all masses of the body is considered to act.
B. Where the sum of the external forces is equal to zero.
C. Where the sum of the moments from the external forces acting on the body is equal to zero.
D. Which is always used as a datum when computing moments.
The "correct" answer is A. I think they're all wrong, although A does strike me as a very bad translation of a possible definition (many questions are in fact translations from other EU states).
I have a limited amount of time to quibble this, and since it's worth 4% of the paper, I thought it worth asking!
Cheers,
David.
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A is definitely the best answer out of a badly worded bunch!, although C in some circumstances could come close.
The question should have been tightened up a bit by specifying that the body is only exposed to forces resulting from a gravitational field. As soon as you consider the possibility of external forces, or, say, electromagnetic forces, the situation described by the given options becomes a little blurred.
What a truly awfully constructed question - surely anyone asking this can't really be serious?, I hope it's just a coffee time teaser, and not being used for determining anything of any importance!
As a good Physicist, David, set them straight!
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Sadly, that's a genuine question from today's Mass and Balance exam. I dithered between A and C, and picked C in the end. I don't really want to go into how I have an exact copy of the question, but since I'm pretty sure it's knocked me off a 100% score for the exam I'm inclined to moan.
The aviation schools do have a system where they can raise a grievance regarding badly worded questions, so I'll take this up with them tomorrow. Thanks for your help NC - I'll let you know what happens.
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A is definitely the best answer out of a badly worded bunch!
I agree. Unfortunately preciseness of both the spoken and the written word is now not thought of as being terribly important in some spheres. I can only assume that liitle importance has been attached to it in schools and universities for some time.
Edited by L'escargot on 07/05/2008 at 07:27
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On the subject of exam questions, having written a few in my time, I agree there is no excuse for sloppiness. But on the other hand ambiguity is often used to separate those candidates who really know from those who memorised the text book. I couldn't say whether that's what's going on here, but it's a very common technique. And whether by intention or accident it looks like it might have worked at some level in this case.
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>Sat an exam today which asked for a definition of the centre of gravity
Admit it - you weren't sitting an exam, you were playing on your Wii fit! ;-)
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Normally I'd agree with you Baskerville. However, in this case we did have a long list of "Feedback" questions, obstentiously obtained by word of mouth from students to sit exams before us. On top of this, apparently there's a list of questions stolen from the JAA which circulate on eBay from time to time, although I've never seen them.
Ironically, if I'd been through and memorised the feedback questions I'd have got this one right since it's in the list! The one we were given is word perfect to the one which appeared in the exam.
A very small minority of people agree with me that memorising questions is not the way to gain a professional qualification, and in fact an instructor at Oxford did some serious messing with our school finals exam which caught a lot of people out.
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All depends whether passing exams is more important than knowing the correct answer, for what you are training for I suspect the knowledge is more important than the tick in the box.
Edited by commerdriver on 07/05/2008 at 12:43
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>>A very small minority of people agree with me that memorising questions is not the way to gain a professional qualification
It very much depends on whether or not you want the professional qualification in question. If you don't, then don't bother memorising questions. If you do, then do.
Your own beliefs are pretty irrelevant - if you're going to put yourself to the trouble of studying, you might as well go to the effort of passing the exams.
Often with professional qualifications, the ability to pass the exams is of more use than what is learned in the exams.
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I need to find out how much rain fell in the Birmingham area on 12 January 2008. Does anyone know of a website where I can do this, please?
I've tried doing Google searches but I just find ones with the mean rainfall for the month, often recorded at a weather station some distance away.
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I cannot answer your specific question, but a few years ago I was involved in an insurance dispute re very localised high winds. I discovered that there is a national network of 'accredited' amateur weather observers. They would certainly have the local information. I found somebody within 2 miles who provided the information I needed and the insurance company subsequently settled in my favour.
I will Google later and post if I find more details
pmh
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Not exactly what you want, but I guess if you email the links on the pages you will get precise info.
www.halesowenweather.co.uk/2008_weather.htm
even better
alvechurchweather.metsite.com/archive/
Alvechurch
Nth. Worcs
138m asl.
52.348 N
-1.948 W
10 miles Sth of B'ham
11th Jan 35.1mm
12th jan 3.9mm
pmh
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email the Met Office at enquiries@metoffice.gov.uk, or phone 0870 900 0100, and ask whether this information is available to the general public.
Edited by L'escargot on 07/05/2008 at 10:12
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I remember helping a friend with a University dissertation about 10 years ago, and local weather records day-by-day were obtained from the met office.
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You didn't say what time of day :)
tinyurl.com/5s87u2
This links to a site called wunderground.com
It's a bit "busy" but you can select "history" and "local weather stations" for most of the UK and for some years back.
Looks like it chucked it down from about 7 in the evening?
Paul
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Thanks - just what I need!
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I found that the last batch of cable ties I bought exhibited a tendency for the "ratchet" to slip if the tie was pulled tight. I'd better explain that I'm using them to stop our fence panels rattling in the wind, and not for tying cables. Could anyone recommend a source of good quality 300 mm cable ties please? I only need a relatively small quantity ~ 100 would be ample.
Edited by L'escargot on 07/05/2008 at 11:56
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Wouldn't it be better to shove some Gripfill, or silicone sealant of the right colour, in?
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How about something stronger - extra long jubilee clips, or some heavy duty gardening wire for example.
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We use cable ties made by a company called Hellerman at work. They do all sizes and colours. Quality is fine, it's a job to break even the small ones.
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How about ..... some heavy duty gardening wire ...
I tried that but it's harder to pull tight than cable ties. I'll stick with the ties and try and find some Hellerman ~ thanks mjm.
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Heavy wire and then twist tight with a pair of mole grips or a using rod slipped in the loop like a garotte?
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Snail -
Any branch of RS Components will do them for you . They have branches everywhere.
I deal with them a lot and have visited their HQ in Corby , one of the most impressive distribution operations I have ever seen , they have some 500,000 items plus in stock.
Go onto Google and put in RS and they come up - search on the website for the branch nearest to you and check the type of ties you want from the on line catalogue ( 1317 results for their stock lines of cable ties alone ).
If you have a branch of Newey & Eyre or Wholesale Fittings near you they will also supply.
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babel fish doesn't do czech, and with the other translators I have found, I can't be sure which of the options is giving me sense of 'train' ans in 'railway train', anybody know ?
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Of course people used to learn definitions and made them part of their discourse.
Multiple-choice questions are one of the academic banes of our time. They are something to do with American pedagogy and tend to be intellectually corrupting, not least because of the ham-fisted way they are worded, as here.
Or perhaps I am missing something and subjecting students to semi-gibberish is a scientific way of testing their mettle (or bottom).
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Lud - if you're curious, there are sample questions on all the ground school subjects here:
www.atponline.gs/jalo/demo.asp
They are, in most cases, identical to the real thing, although you obviously have to pay Bristol £70 quid if you want access to the full collection. That's on top of £63 per exam for the CAA to feed it through their reading machine...
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Took the sample test on Air Law. Didn't quite manage 50 per cent though... I imagine that makes me a pretty poor air lawyer.
:o}
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Pass mark is 75%, I think the Oxford average for Air Law is about 95%. There's a trick to it though - the longest answer is nearly always right, if it's "C" it's even better, and the Operator is responsible for everything... :-)
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And of course it would help to have gone through the stuff at least once first...
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But wouldn't you rather have a pilot who could fly and land rather than good at discussing who would be to blame?
pmh
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borasport, my old Lonely Planet guide tells me that express train is RYCHLIK and ordinary train is OSOBNI. My new Lonely Planet says train is VLAK. Arrivals is PRIJEZDY and departures ODJEZDY.
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my lonely planet (best part of 5 years old) also says train is VLAK
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I've learnt something today......its that a hot 9 hours in a custody suite surrounded by 109 Cannabis plants (no they were definitely not mine) has somewhat stunned my reasoning and cognitive skills. (tried reading this thread a few times)
Edited by Pugugly on 08/05/2008 at 00:26
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I've learnt something today......its that a hot 9 hours in a custody suite surrounded by 109 Cannabis plants (no they were definitely not mine) has somewhat stunned my reasoning and cognitive skills. (tried reading this thread a few times)
OK man OK.............yeeeeeeaaaaaaaaaaaaaaaah!
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Even to the extent that you've put this in the wrong part of the threaded thread?
Shocking!
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Was it any good though PU?
Edited by Lud on 08/05/2008 at 16:00
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I expect he can't "hear" you Lud. Well into his 40th playing of "Dark side of the Moon" by now I should think!
;-))
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Wondered if anyone has any experience of using one of those tailors who visits our shores (usually from the far east) and provides bespoke suits at a fraction of the saville row price.
Advertised prices are very tempting but is the quality and service any good?
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I bought one from the guy who advertises a lot. It was fine but since losing some weight I seem to be spot on for M&S sizes so I get mine there and that is quite a lot cheaper. If you can't a find a chain store suit that fits then it's worth alook but you'll pay about double chain store if you want anything other than the cheapest cloth.
Have you tried a place called Slaters they have branches all over and do free alterations and whilst they are not super fashionable their staff are very good and you don't feel hurried. Prices are v good.
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It's that time again. I've just been shopping on the net for house insurance, and interestingly the comparison sites are all offering me similar prices to the initial quote from my existing insurer, with one exception. If I go with R K Shipman I can apparently save about £120 or so.
Obviously I'd compare the fine detail of the policy, but before that I wanted to find something out about them, never having heard of them before.
I don't suppose anyone here has heard of R K Shipman or dealt with them in any way?
If not I'll probably decide you get what you pay for and stick with my current insurer (not that I know what they are like in the event of a claim, but at least we've all heard of Egg!)
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We'd been with the Prudential for house and contents insurance for around 40 years and the other half from before that for vehicle insurance.
About three years or four ago the Pru (which has always served us extremely well on the rare occasions we needed to claim) brought in Churchill as its underwriter.
The premiums had been steadily rising in the current decade and eventually were nearer £500 than £400.
Out of curiosity I did an Internet check on other companies' premiums and discovered that Churchill actually changed just under half the Pru's price, with little variation in the cover...:-)
You won't be surprised to learn that I did a swap.
R K Shipman's website is at:
www.rkshipman.co.uk/
Home insurance at:
www.rkshipman.co.uk/specialisms/park-homes.html
Also see:
tinyurl.com/3gv9jq
It is a broker and also financial adviser.
Edited by Stuartli on 10/05/2008 at 14:58
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Dipstick, being in the position of finding myself out my home for 6 months at least, due to a fire, I will in future be paying close attention to terms & conditions of my insurance renewals as opposed to just the price.
First time I have really had to claim on any insurance and its been an eye-opener. I will also be reviewing my contents sum insured - I had previously done an educated guess of total contents, high value etc but did not realise, for example, that the cost of getting all your clothes, furniture cleaned etc comes out your contents sum insured. And so does the cost of the removal firm who takes them all away! And you can bet that these companies will be charging a fortune!
Having said all that, I don't now how you could check this sort of thing out at renewal. And my insurance is through Egg.......
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The best price that I have found was via
www.smartandcook.co.uk/page.asp?PageID=1
I don't work for them but my mother nad FIL use them.Personally use Hiscox ,as they offer a lot of extras.
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I'm just renewing, and appear to be able to save thirty per cent with RIAS. You do have to meet certain criteria, like saga!
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Useful info guys, thank you. And, in a phrase I don't use every day, you've put the willies up me now BobbyG, so I might have to perusulate the small print pronto.
Edited by Dipstick on 12/05/2008 at 21:33
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I have a new HD TV with built in Freeview and a Sky dish and box.
Do I have to get another box to get BBC HD TV?
The Sky thingy is subscription-free.
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Afraid so.
The standard sky box is only sd. In time they will be putting HD on freeview, but again, existing boxes are sd only.
I would be looking at HD sat boxes to replace your sky box.
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Three of Panasonic's new TV models include a Freesat tuner, but a bit late for you now...:-(
www.panasonic.co.uk/html/en_GB/733435/index.html#a...5
Info on Freesat (BBC and ITV venture) at:
www.freesat.co.uk/
General info on HD boxes:
tinyurl.com/3p6eh7
Edited by Stuartli on 10/05/2008 at 18:10
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I am in process of dealing with loss adjustors that my ins company have appointed to deal with my house fire.
Can anyone tell me how loss adjustors work ie. do they get bonuses / incentives from ins company to make the claim less? If so how does that work? And would it make any difference that the fire was as a resuly of neighbour's negligence so hopefully my company will be claiming off his?
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Loss adjusters are there to assess the damage and negotiate on behalf of the insurance company.
They will try and minimise any payout so they may agree to pay for somethings but not others. Where you a completely innocent party there is little they can refuse but will quibble on minor issues - to justify their fee???.
However each insurer will pay their own damages.
A neighbour's in-laws had their house 50% burned down due to "electrical fault next door" - that burned the roof off both houses. Delays due to who paid what on the communal roof held matters up - they are back in their home for 2 weeks - the fire happened in Sept 07
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Cheers for that FB - think I might be in a slightly better position that your neighbours in-laws due to the fact that both sets of loss adjustors have agreed on one project manager overseeing all the wroks on behalf of the two parties.
On the day after the fire, I had a fire investigator out for a full 8 hours on behalf of my insurance company. He told me his role was to collect all the evidence required so that my ins could claim off next doors.
It would make things a lot easier if they just gave me an amount of £x and told me to deal with all the cleaning, removals etc!!!
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In the past 2 months or so there appears to have been a significant increase in the number of aircraft overflying chez pmh. Possibly it has been going on a little longer, and it is the increased time spent out of doors in the better weather that has made it more obvious.
The offending aircraft are flying North, (possibly NNW), and frequently climbing, hence the additional engine noise. The aircraft are not very low, and the worst offenders are 747s. It is surprising how much quieter the modern 2 engined aircraft are.
The location is 2km due north of the M25 Junction 24, Brookmans Park.
Under the new proposals issued about 3 months ago I thought that the area was generally seen to be a 'winner', but this is too soon for those proposals to have been implemented.
The question to our 'flying friends' is, are there any on line resources that show air maps and routings? My initial Googling has not found any informative material.
pmh
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The same planes are over here, a little east of Daventry, about 10 mins after you see them!!
As you probably know Brookmans Park is a significant navigational waypoint marked by a radio beacon (google for BPK VOR). It is also the end point for several standard instrument departure (SID) routes from Heathrow. I've been trying for a couple of days to access the Air Traffic Service website for more details but it seems to migrating to new servers and not all info is yet available. Try www.ais.org.uk/ yourself and then link to the new site.
Possible that aircraft that were previously being routed directly towards points north (eg the TRent radio beacon near Carsington water) are now following the SID to it's end.
The professional pilots forum www.pprune.org.uk/ has areas for spotters and others to pose questions where someone more knowledgeable than this retired enthusiast will be able to help you!!
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Bromptonaut
Thanks for that. I was aware of BP being a significant location, but what was interesting is the change that appears to have occurred recently. I have read somewhere that more aircraft are now using a more uptodate and accurate navigation system. Possibly thay are now all actually following a more precise track and have therefore become more noticeable?
I will follow the links after the weekend.
thanks
pmh
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What is the symbol '@' called?
OK I know it's the symbol for 'at', but does it have a name?
'&' is called an ampersand, so what's '@' called?
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The Poles call it a monkey.
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@ is called asperand, if you care to believe Wiki.
More at: tinyurl.com/f7acw
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The Israelis call it a 'strudel' - pronounced 'shtrudel' - a germanic roly poly; which of course it resembles.
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Something dim and distant ( possibly me ) says it used to mean "circa" as in "about" or "approximately". That would also tie in with the shape. More than likely rubbish mind !
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A little Googling reveals
apenstaartje - Dutch for "monkey's tail"
snabel - Danish for "elephant's trunk"
kissanhnta - Finnish for "cat's tail"
klammeraffe - German for "hanging monkey"
papaki - Greek for "little duck"
kukac - Hungarian for "worm"
dalphaengi - Korean for "snail"
grisehale - Norwegian for "pig's tail"
sobachka - Russian for "little dog"
For a more thorough approach
www.atsymbol.com/history.htm
makes educational and entertaining reading!
pmh
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I tried to edit the above to provide a more pictorial approach, ( I was timed out even though it allowed me into edit mode!)
So for those preferring pictures
www.wisegeek.com/what-do-they-call-the-at-symbol-i...m
I am suprised that some cultures have not picked even less acceptable graphical representations;)
pmh
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Master space sign (old).
At sign (*old*).
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In one of those long motorway conversations I'm convinced that Mrs P said that she was listening to the Welsh language service of the BBC and that one of the presenters (I'm sure she said he was called Jones - but perhaps not) called it a snail (just looked it up and its "malwen") when giving out an e-mail address.
Edited by Pugugly on 13/05/2008 at 00:07
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I prefer to believe the OED. It is not an ampersand (that is the & sign). It has many names in foreign languages as posted above. In English though we remain remarkably unimaginative. To us it is simply the "at" sign, or the "commercial at" sign.
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Adrian - the term is asperand, not ampersand.
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Now I'm confused, surely '&' is an ampersand, or have I been sadly misled these last 40 years?
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I have noticed on a couple of TV's that the sound and vision are not perfectly synchronised when watching via the built in freeview.
Is this a common problem? And does anyone know of a fix for this?
Both the TV's seemed to be OK when watching normal terrestrial channels.
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Very common on cable, and I attribute it to the fact that the signal is digital and has perhaps to be converted from analogue at the top end and back into analogue at the bottom end. This sometimes grotesque out-of-synch is accompanied by that interference in which everything goes into little squares, and another sort that results in a silent blank screen for up to five seconds.
These are some of the improvements that have been brought to us by technical progress, along with a huge but strangely narrow choice of the most staggering schlock.
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We have same problem with set-top box but switching channel then back again solves it - not a clue why though
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Very bad on Freeview via local transmitter - many channels become unwatchable so we end up watching via the analogue signal.
Never had such a problem with our cable service.
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This is common with many digital TV setups, satellite or terrestrial. The root problem is that the video signal undergoes a lot more (time consuming) processing than the audio signal prior to transmission, so unless care is taken during the encoding process they end up out of synch.
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>>Very bad on Freeview via local transmitter ->>
This is most likely due to signal quality and/or strength; sometimes our main LCD set completely rejects the QAM64 transmissions of Sky, ITV etc, but is fine on all the other MUXa (QAM16).
On the second TV, a 21in CRT model with a set top box, plus my computer's PCI Freeview TV card, the feed from an aerial amplifier can be varied which helps to cure temporary signal problems.
Once the full Freeview digital signals come on song the situation should improve.
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What was the price of your last (and recent) delivery of heating oil? I need to get myself mentally prepared for our next delivery.
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Have you considered forming a small co-operative with local residents and buying in (bigger) bulk?
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L'escorgot, try the following link. Friend who uses it says that it is spot on.
www.boilerjuice.com/priceHistory.php
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Wahay...
That site has just quoted me £50 less than my usual supplier for 1000 litres
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It's just quoted me £200 MORE than I paid two months ago, so oil prices are either going completely crazy (50% up in two months?) or it's not done a very good job for me.
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Good suggestion. There was an interesting article on Radio 4 yesterday about local residents forming a co-op - it seemed to work well and save a great deal of money.
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I've just phoned my oil supplier and today's price is 74.44p/litre for 500 litres and 70.03p/litre for 1000 litres. With the price rising rapidly I'm toying with the idea that it might be cheaper in the long run to buy 500 litres now rather than wait until there is room in the tank for my normal order quantity of 1000 litres. Is there a snag to this that I haven't envisaged?
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I've just phoned my oil supplier and today's price is 74.44p/litre for 500 litres and 70.03p/litre for 1000 litres.
I should have said 66.52p/l for 500l, and 62.58p/l for 1000l. I'd assumed that VAT was 17.5% whereas in fact it's 5%. A quote from boilerjuice.com wasn't significantly cheaper and their delivery is 6 to 8 days compared to 2 to 3 days from my usual supplier.
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My last fill a few weeks ago was 55p/l odd. I get a quote from BJ, and then ring round. Normally get to the same figure just by quoting BJ. I was paying 30p/l not so very long ago.
Escargot - suggest you check with Boilerjuice - 70p/l is way out of order unless you are on a Scottish isle.
Edited by oldnotbold on 14/05/2008 at 14:53
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I lay in the bath last night listening to a fast dripping tap, being too lazy to get up and turn off properly and too hot to plug with big toe.
What was interesting was the considerable pitch range of different 'plops', with no discernable pattern to it. Frequency 2 drops/sec. Can anyone explain?
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Something to do perhaps with the randomly varying direction of ripples on the water surface causing different impact sounds and sound reflection from different parts of the bath or bathroom? Bathroom acoustics are complex but sharp. There may be echo effects in a bath too, assuming it is made of a hard reflective material like iron or porcelain.
I imagine the drops coming off a dripping tap are all the same size, but only if they come from the same part of the spout. Sometimes taps have two or more drip sources, and in that case the drops may be of different sizes.
Edited by Lud on 15/05/2008 at 00:26
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Some people have too much time on their hands ;-)
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Following a car with a bike strapped to its roof got me wondering if it would remain upright at high speed without any aids. After all, it's the forward momentum of a bicycle that stops it falling over. Isn't it? So why would a push bike on a high-speed train not stand up on its own.
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I would have thought it was to do with the gyroscopic effect of the turning wheels. No expert though so not sure!
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It would only stay up if the wheels were going round.....
That's why warm up rollers for cyclists have to drive the front wheel (unless the front wheel is removed and the bike manually held up) - otherwise it is very difficult to 'ride'!!!!
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>it's the forward momentum of a bicycle that stops it falling over. Isn't it?
The gyroscopic effect of the wheels turning is a big contributing factor.
edited to say: double pipped to the post.
Edited by Billy Whizz on 15/05/2008 at 10:12
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But I can cycle pretty damn slowly without falling over. What about penny farthings? Big wheels, 2 revs per minute...
Edited by Dynamic Dave on 15/05/2008 at 11:22
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your body is actively balancing the bike. Penny f arthings wheels since they are so large have large rotational momentum.
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Penny f arthings wheels since they are so large have large rotational momentum.
Anyone younger than about 40 probably hasn't even heard of a farthing. It's only us oldies that know what you're talking about.
Edited by Dynamic Dave on 15/05/2008 at 11:21
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Don't you just love that swear word software!!
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The gyroscopic effect on a bicycle is nil - see recent scientific papers.
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>>The gyroscopic effect on a bicycle is nil
This isn't quite true, but, it is fair to say that it isn't gyroscopic torques that keep a bike upright.
Effectively, the geometry of the front wheel steering axis makes the bike automatically steer into a fall - which is also how a rider makes corrections.
What the gyroscopic torques do provide is some extra stability, they effectively slow down the bike's dynamics. But, they aren't responsible for keeping the bike upright.
There is some gyroscopic effect from the wheels, but, it isn't this that's responsible for keeping a bike upright - it's the steering kinematics, and rider corrections which do that.
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Fair point, NC, for what of course I was intending to write was "The contribution of the gyroscopic effect to keeping a bicycle upright is nil."
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Sorry MM, I'm clearly in a pedantic mood today!
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