Quiz

[Diane CarneyModerator @dianecarney30678]

Indeed.
And whether you have ever been a rider on the Wall of Death! Try telling them there's no such thing a centrifugal force!

Edited By Diane Carney on 09/02/2015 23:56:09

[FMESParticipant @fmes]

Posted by Diane Carney on 09/02/2015 23:55:38:

Indeed.
And whether you have ever been a rider on the Wall of Death! Try telling them there's no such thing a centrifugal force!

Edited By Diane Carney on 09/02/2015 23:56:09

Always thought it was Centripetal reaction.

[Ian S CParticipant @iansc]

The North Atlantic summer/winter Plimsoll Line would be to take into account the ice melt in summer when the sea becomes less saline.

Ian S C

[Ed DuffnerParticipant @edduffner79357]

If it's related to the tidal forces then it would depend where the moon is when the ships set off. If both ships set off when the moon is fully around the other side of the earth then there would be no difference in tides affecting either vessel. The text kind of contradicts itself by stating "all things equal" but there is then an assumption of tidal difference.

It could be argued that if the moon is east of the Azores it is pulling on the earth's crust and causes a tide to travel eastward. As the moon passes over head of the two vessels from east to west, the pull of the moon then starts to pull westward and influences the motion of the westward bound vessel because of a tide now travelling in a westward direction.

Ed.

[Neil WyattModerator @neilwyatt]

No tidal differences ED, its all just down to the earth's rotation.

Also, the tides bulge both on the side opposite the moon and the far side*, that's why we have them twice a day!**

Neil

*I should know, having grown up in Barry with a tidal range of 49 feet.

**Unless you live on the Solent.

[Bob Brown 1Participant @bobbrown1]

Still twice a day on the Solent, it is more a longer duration of high tide and a shorter ebb tide period or as least that is how I see it.

Bob

[Neil WyattModerator @neilwyatt]

Apparently it depends exactly where you are with double high tides at Calshot.

http://www.solentpedia.info/our_coastal_zone/waves_and_tides/

Neil

[Bob Brown 1Participant @bobbrown1]

other side of the water

[Neil WyattModerator @neilwyatt]

To be honest, with only ten foot of tide I'm surprised you can tell the difference!

Neil

[Mark CParticipant @markc]

Yep, not like us lads with a "proper" tide like we have up here on the Mersey and Dee

Mark

[Neil WyattModerator @neilwyatt]

All of 2/3 of what we have in Barry

When I were a lad I used to sit on the dock of the bay and watch the tide roll away.

Neil

[Mark CParticipant @markc]

When I were a lad, I used to stay well away from the edge 'cos it used to feel like it was pulling me in! And in those days it was reckoned you would die of poisoning before you drowned – not a problem for you lads that grew up eating bread made from sea weed….

Mark

[Chris Pattison 1Participant @chrispattison1]

The one that has not had its bottom scraped. Barnacles giving a major amount of friction. The cross-sectional area and hull length will also influence the speed. And of course the current flow, such as the Gulf Stream. Too many variables in my opinion.

[Ian S CParticipant @iansc]

I think the one travelling east would have a problem with the coast, it's only 907ml to Lisbon. It's about 2300ml to America.

Ian S C

[Neil WyattModerator @neilwyatt]

> Too many variables in my opinion.

Hence 'all things being equal' – I don't expect anyone to go out with a spring balance and check the results!

Neil

[Gordon WParticipant @gordonw]

This is starting to sound like the parting off theories. And don't forget quantum effects.

[Neil WyattModerator @neilwyatt]

> 2300ml

I thought there was more water in the Atlantic than that.

Neil

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