Does the water rise or fall?

[clarkBENT]

A man rowing a boat in a lake throws his anchor into the water.

Does the water level rise or fall?

[Newf]

well if a glass is full of water and you put ice or anythng else in it it rises over the glass an makes a mess, so the more you add to the lake the more the water level rises....only thing that makes sense to me at 6:30 AM on a saturday morning :)

[Night Prowler]

neither.......the weight of the anchor still displaces the water while in the boat?...

[clarkBENT]

neither.......the weight of the anchor still displaces the water while in the boat?...

Correct! Technically, the weight of the anchor has already displaced the water in the lake, while in the boat.

[theprinceofsorts]

????????????????????????????????
since when does the level of water depend on the weight of whatever you want?????????????
Poor Archimedes, who tried to explain clearly it depends on the volume plunged in the water. Now, as we do not know anything about the size of the anchor, nor about the boat, it is not possible to decide if the weight loss of the boat which will make it float higher, meaning less of its volume would be in the water compensates the extra volume of the anchor.

[fifties]

????????????????????????????????
since when does the level of water depend on the weight of whatever you want?????????????
Poor Archimedes, who tried to explain clearly it depends on the volume plunged in the water. Now, as we do not know anything about the size of the anchor, nor about the boat, it is not possible to decide if the weight loss of the boat which will make it float higher, meaning less of its volume would be in the water compensates the extra volume of the anchor.
That's irrelevant; even if it were a toy boat, with an anchor weighing but a few ounces, the point is that the water level was displaced once the boat-with anchor- entered it, and as long as that total quantity was still on -or in- the water, there is no change.

Put another way, the anchor, when in the boat, caused the boat to displace X amount of water volume. Once the anchor went into the drink, the boat was relieved of the anchor's share of the displacement, which now became assigned to the anchor by itself. The total displacement however, would still be the same.

[junkcollector]

I've got to agree with theprinceofsorts. When the anchor is in the water it's weight is of no importance what matters is the volume. Example, a wading pool floating in your backyard pool with a 55 gallon drum in the wading pool. The drum is empty ( full of 55 gallons of air ) sealed. Take the drum out of the wading pool, put it in the backyard pool. Force it to the bottom of the backyard pool ( as the Anchor did in the lake ), does the water rise?

[Night Prowler]

ok....revised answer.....depending on the weight of the anchor....the water may rise....or....it may fall.......but then again....in a perfect condition it may just stay level.....:lol:

[UNVMYWJ]

Think that the question had to be specific on wether the water will rise on the side of the boat or the overall displacement of water in a known volume.

Technically both arguements are right.

JMO

[Terryl]

Ok look at this scenario:

When the anchor is in the boat its part of the boats overall displacement, if the anchor was made of iron and say one cubic foot in size it would weigh 450 pounds, it would then cause the boat to displace an additional 450 pounds of water, this would have caused the lake level to rise by X amount.

Now when the anchor is dropped into the lake it no longer causes the boat to displace 450 pounds of water, the lake level would drop to a new level (Y) and the anchor would only raise it by W.

Why W and not Y?

Because the anchor is not able to float on the water, it now displaces 1 cubic foot of water by volume, this causes the lake to rise by W not X (old displacement) or Y (new displacement of the boat minus the weight of the anchor).

Notes:

1 cubic foot of water equals 64 pounds, 1 cubic foot of iron is equal to 450 pounds, iron has specific gravity of about 7, this means that a certain volume of iron is 7 times heaver than an equal volume of water, but it only displaces an equal volume in size.

If the anchor was made of lead it would weigh 708 pounds and have a specific gravity of 11.3.

[JCO]

Thanks terryl for the advanced logic and physics course... My question is are there any walleye in that lake and what are they bitting on?? LOL

[Terryl]

I'd say ether crank bait or old chicken guts.

[JCO]

I'd say ether crank bait or old chicken guts.

And I was going to try leaches....LOL
Wheres that chicken....:thumbsup:

[pugsycan]

I'd say ether crank bait or old chicken guts.


And I was going to try leaches....LOL
Wheres that chicken....:thumbsup:
Yeaaaaa BUT what way is the boat facing :noidea::okay:

[Terryl]

Use 1 week old chicken guts, they love the smell, but it will keep other fishermen away.

[Terryl]

Yeaaaaa BUT what way is the boat facing :noidea::okay:

Away from shore, or any pier pilings.

Just don't let Pug's drive.

[JCO]

Yeaaaaa BUT what way is the boat facing :noidea::okay:

As always nose into the wind...LOL That way i dont smell Terryls bait...LMAO:thumbsup:

[pugsycan]

Away from shore, or any pier pilings.

Just don't let Pug's drive.

ONCE you wreck a boat once and they never let you forget it :D

[JCO]

ONCE you wreck a boat once and they never let you forget it :D

I guess it has to do with the quality of the wrecking job...:comfort1:

[Night Prowler]

no worries......mabs will weld it back together.........:tehe: