quiz question

[Gary]

Pete's right:


Put it this way.....if I take a pee from a boat the water level will stay the same, it don't matter if I pee a pint of a thousand gallons

So why don't you weight less after a good dump? :lol:

 

[SVB]

Squib and Mark +1.

Depends where is is marked, assuming your are looking for the actual level, the water level on the side of the boat will fall but the actual depth of water in the lake will remain the same.

S

 

[RogerS]

It will vary depending on whether the moon is over head or on the other side of the earth.

 

[bugbear]

Can I change my mind?

This explanation from a physicist friend of mine. Mind you he got the aircraft on the treadmill wrong !

Up thrust equals down thrust equals weight of water displaced. Increase in level! Doesn't matter if the weight is in the boat or outside of it in the water. The sum is the same.

Are you SURE he's a physicist?

BugBear

 

[RogerS]

Actually astrophycisist...brain the size of a planet. I did say that he got the plane on the treadmill wrong!

 

[Steve Maskery]

You forget the boat now displaces less too

No it doesn't, the boat itself still displaces its own mass. Before it was the boat plus its cargo doing the displacing, but the boat itself still displaces its own mass.

if I take a pee from a boat the water level will stay the same, it don't matter if I pee a pint of a thousand gallons

True, sort of, but only because the density of pee is the same as the density of the water in the lake*. The point of this calculation is that the density of the cargo is greater than the density of the water in the lake.

Depends where is is marked, assuming your are looking for the actual level, the water level on the side of the boat will fall

Correct!

but the actual depth of water in the lake will remain the same.

Ah, incorrect. It drops slightly.

It will vary depending on whether the moon is over head or on the other side of the earth.

And, of course, whether there is an R in the month

Are you SURE he's a physicist?

Actually astrophycisist...brain the size of a planet. I did say that he got the plane on the treadmill wrong!

This one too. I should check his creds if I were you. Are you sure he said Astrophysicist and not AstroTurf Rep? This is basic Archimedes.

S
*I don't actually know if the density of urine is the same as lake-water, but, for the sake of this discussion, let us assume that it is, shall we? I, for one, am not going to go to the trouble of measuring it.

 

[big soft moose]

*I don't actually know if the density of urine is the same as lake-water, but, for the sake of this discussion, let us assume that it is, shall we? I, for one, am not going to go to the trouble of measuring it.

if you did , many might assume you were taking the pi$$ :lol:

(btw urine is probably slightly more dense than lake water on account of the disolved mineral salts - but then again we dont know how clean the lake water is.... ](*,) )

 

[RogerS]

......

(btw urine is probably slightly less dense than lake water on account of the disolved mineral salts - but then again we dont know how clean the lake water is.... ](*,) )

Sorry, bsm, it's the other way round. Slightly more dense than water.

 

[big soft moose]

......

(btw urine is probably slightly less dense than lake water on account of the disolved mineral salts - but then again we dont know how clean the lake water is.... ](*,) )

Sorry, bsm, it's the other way round. Slightly more dense than water.

doh

on the other hand of the lake is surrouned by parkland it probably has a lot of disolved nitrate , phosphate and sulphate in it, so it may have more disolved salts per cu than the urine and thus the urine might be less dense

 

[barkwindjammer]

You dont half talk some toss* :roll:




*regional spelling variations may vary

 

[big soft moose]

You dont half talk some toss* :roll:
*regional spelling variations may vary

(for those who wonder wtf the relevance of this is barkwindtroller is carrying on an exchange from a different thread - where he expressed the view that a website selling principally stuff like wadkin was jammed with cheap foreign rubbish, and i told him he was talking toss, which was not a mispelling of tosh as he would like to believe)

 

[barkwindjammer]

shut it ya Doris !

Studders he's doing it again, I didn't even do anything

 

[Doctor]

Well thanks guys, that's cleared that one up then.

So to summerise, my answer should be........ The water will definitely fall some of the time unless the weight floats or someones had a wee, with or without high mineral salts, or a dump, or if the moon is overhead. Then just to finish on a high I have to change the subject and create an arguement......... got it........ many thanks.

Bloggy

 

[Doctor]

I have another quiz question if anyone is up for it? its quite hard.....

 

[Oryxdesign]

Come on then lets have it

 

[Eric The Viking]

Come on then lets have it

Quite!

If you don't come up with a good distraction soon, I'm going to have to "jbex"*
(jbex-ing from home, mutter, mutter...)

Not enough even for snowballs here - just enough for sliding around.

Cheers,

E. (who mentioned it, but thinks he got away with it)

*ROT-13

 

[StevieB]

Actually you do lose weight when you take a good dump, its simply that most bathroom scales are not sensitive to measure the difference. From extensive research when I used to work as a docker in the holidays while at Uni I can confirm that with a set of sensitive weighing / parcel scales, as used by customs officers to weigh cargo, you can indeed show an appreciable decrease in weight post-dump. This has been verified by a number of other dockers in duplicate experiments. Sadly Uni called me back before we could answer the question of whether consistency , and hence water content, was correlated with weight loss in a linear fashion.

This has been a public information bullitin and you attention has been appreciated

Steve

 

[Chataigner]

I'm with Eric, since the object is called a weight, we may reasonably assume it is dense, thus it displaces more water (its own wieght) when "floating" (by means of the boat) than when sitting on the bottom when it displaces only its own volume of water.

Should the weight have a density of one, then the level remains the same.

For a density greater than one, the level falls.

For a density less than one, the weight floats and the level remains the same.