quick puzzle.

[markie]

A man is in a rowing boat, floating on a lake, in the boat he has a brick. He throws the brick over the side of the boat so as it lands in the water, the brick sinks quickly.

The is, does the water level go up or down, ?

 

[big-all]

stays the same as the water displaced by the brick would be ballanced by the slightly lighter boat floating slightly higher in the water

 

[markie]

stays the same as the water displaced by the brick would be ballanced by the slightly lighter boat floating slightly higher in the water

Wrong,

 

[notb665]

Does it depend on the density of the brick?

 

[markie]

Does it depend on the density of the brick?

your on the right track, you need to think on the lines of a little bit of physics,

 

[notb665]

Does it depend on the density of the brick?

your on the right track, you need to think on the lines of a little bit of physics,

Having a degree in chemistry obviously won't help then!

 

[big-all]

ok the level will fall as the displacement of the brick in the water is less than the weight it would displace when in the boat

 

[Porker]

Brick will be more dense than water because it sinks therefore the effect whilst in the boat will be to displace more water than its volume (making the lake level rise) than when it is in the lake itself where it displaces its volume

therefore the lake level will drop?

 

[Thermo]

"a body immersed in water will displace a volume of fluid that weighs as much as the body would weigh in air"

should we not be shouting eureka?

 

[vokera80e]

i thought the same as big-all.The brick in the boat was displacing the water and when it was chucked in the water i thought it would have still displaced the water...?

 

[tawelfryn]

the water goes down the moment it leaves his hand throwing into the lake = to the displacement it was adding to the boats weight while it was in there. When it hits the water and sinks, the water rises to that of what it was while the brick was in the boat. Does that sound right?

 

[markie]

You's have got it, i think....

Go on the net and go to, quant riddles and puzzles with answers, scrool down to number 21 and find the answer, it's a bit too tec for me,

 

[tawelfryn]

I think I was slightly wrong due to masses and volumes, lol I liked physics in school

 

[ninebob]

"a body immersed in water will displace a volume of fluid that weighs as much as the body would weigh in air"

That can't be right, surely? What bearing does the weight of the article have on the volume of liquid it displaces?

 

[notb665]

"a body immersed in water will displace a volume of fluid that weighs as much as the body would weigh in air"

That can't be right, surely? What bearing does the weight of the article have on the volume of liquid it displaces?

You mean 'mass', right?