physics question

[Bushmaster]

You are in a canal boat motoring along a canal. The canal passes over an aquaduct. Does the load on the aquaduct's supports increase as the boat passes over?

[bite-me]

is this homework

Bushmaster said:

You are in a canal boat motoring along a canal. The canal passes over an aquaduct. Does the load on the aquaduct's supports increase as the boat passes over?

[groucho]

I suppose so.

[Fex2005]

No

[Shuvi]

No, because the boat displaces water. It displaces an amount of water that equals the boats weight. This means the load never changes.

[buggalugs]

I asked this question a year or two ago, IIRC the answer is no. HTH

[gazza_3]

No, but the water pressure on the Aquaduck will.

HTH

[s2art]

No. (there may be some effects caused by the boats movement)

[elster]

buggalugs said:

I asked this question a year or two ago, IIRC the answer is no. HTH

This really is a popular quaestion.

[hugoagogo]

no, but the load increases on those supports (and the rest of the canal) when that boat enters that section of canal (through a lock or whatever)

[Fex2005]

Shuvi said:

No, because the boat displaces water. It displaces an amount of water that equals the boats weight. This means the load never changes.

Thats what I thought aswell

Edited by Fex2005 on Monday 18th August 17:16

[SiH]

The answer is no. Categorically no.

Please god don't let this become the next aeroplane/conveyor belt conundrum!

[hugoagogo]

what about the other question:

a boat floating on a section of canal, say 100m between two locks, has 1 tonne of lead ingots on board

the canal boat captain(?) chucks the lead ingots over the side, one at a time

when he's finished, what happens to the level of the boat and to the level of the water?

what if he has a tank containing 1000 litres of water and he pumps this over the side?

[Fex2005]

dibbers006 said:

Where does the Displaced Water go then?

It will be displaced at the ends of the viaduct. Same as if it rains, (the viaduct does not fill up and over flow) it is displaced along the viaduct.

The only time I can see the load increasing, is if the boat was lowered into the viaduct (instead of floating along onto it), and even this would only be a temporary load until the water is displaced off the viaduct at each end.

Edited by Fex2005 on Monday 18th August 17:23

[Fex2005]

dibbers006 said:

Where does the Displaced Water go then?

It will be displaced at the ends of the viaduct. Same as if it rains, (the viaduct does not fill up and over flow) it is displaced along the viaduct.

The only time I can see the load increasing, is if the boat was lowered into the viaduct (instead of floating along onto it), and even this would only be a temporary load until the water is displaced off the viaduct (at each end into the canal).

Edited by Fex2005 on Monday 18th August 17:25

[White-Noise]

I can see why there are lots of no's on here. But if you put loads of boats on the canal then there may be a noticeable rise in the water level. Surely if the water level on the aquaduct is higher then the answer would be yes! So why wouldnt the answer be yes?

[DeadMeat_UK]

At least we can categorically say it won't be able to take off.

[SLacKer]

hugoagogo said:

what about the other question:

a boat floating on a section of canal, say 100m between two locks, has 1 tonne of lead ingots on board

the canal boat captain(?) chucks the lead ingots over the side, one at a time

when he's finished, what happens to the level of the boat and to the level of the water?

what if he has a tank containing 1000 litres of water and he pumps this over the side?

Wouldn't he be better off selling the lead....it is fetching a good price.

[groucho]

Shuvi said:

No, because the boat displaces water. It displaces an amount of water that equals the boats weight. This means the load never changes.

If the water went over the side I'd agree with you.

[groucho]

SiH said:

The answer is no. Categorically no.

Please god don't let this become the next aeroplane/conveyor belt conundrum!

What was that one, then?