Teaser #1:
You're sitting in a boat in the middle of a lake. You have a considerably large rock (say, basketball sized) in the boat with you. If you throw the rock in the lake, will the level of water in the lake
a) rise,
b) fall, or
c) stay the same?
Teaser #2:
A balloon (inflated, of course) is tied to a house brick, and dropped in a deep lake. The brick is heavy enough to drag the balloon under water. After some time, the system stabilises itself and floats at some arbitrary depth. If the brick is dragged by hand down some more, will it then
a) continue to sink to the bottom
b) float to the surface, or
c) eventually return to the same depth it was at before being moved?
This second one is a tough one, and I thought I had the answer, but have since had a rethink and I am not sure if I'm right.
Answers must be given with an explanation (ie, no guessing, people! )
Oh, and throw any others you know of up here - I'm always keen for a challenge.
Cerb
You're sitting in a boat in the middle of a lake. You have a considerably large rock (say, basketball sized) in the boat with you. If you throw the rock in the lake, will the level of water in the lake
a) rise,
b) fall, or
c) stay the same?
Teaser #2:
A balloon (inflated, of course) is tied to a house brick, and dropped in a deep lake. The brick is heavy enough to drag the balloon under water. After some time, the system stabilises itself and floats at some arbitrary depth. If the brick is dragged by hand down some more, will it then
a) continue to sink to the bottom
b) float to the surface, or
c) eventually return to the same depth it was at before being moved?
This second one is a tough one, and I thought I had the answer, but have since had a rethink and I am not sure if I'm right.
Answers must be given with an explanation (ie, no guessing, people! )
Oh, and throw any others you know of up here - I'm always keen for a challenge.
Cerb
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