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[Urist Imiknorris]

as it turns out that the stone sinks only after ALL of the ice has melted

Wait, what?  That implies the stone is the density of water.

No it doesn't. This is a physics problem. It is modeled in a simplified way.

EDIT: Oh yeah, it is D. I thought C and D were switched for some reason.

[Darvi]

as it turns out that the stone sinks only after ALL of the ice has melted

Wait, what?  That implies the stone is the density of water.

No it doesn't. This is a physics problem. It is modeled in a simplified way.

So basically Ice is very, very light?

Also: first to answer correctly (if only by dumb luck)

[G-Flex]

as it turns out that the stone sinks only after ALL of the ice has melted

Wait, what?  That implies the stone is the density of water.

No it doesn't. This is a physics problem. It is modeled in a simplified way.

The question doesn't imply it, but what Il Palazzo said implied it. If the stone can only sink after all the ice surrounding it has melted, that implies that the density of the stone is infinitesimally higher (i.e. higher but by an infinitely small margin) than that of water, otherwise it would sink while it still had some finite volume of ice attached to it.

[Leafsnail]

Well, it wasn't chronological so much as "What happens when a) the ice melts and b) the stone falls".

Or at least that's how I read it.

Uh, damn, need to rerail... uh...

Well, it's now the weekend.  And I don't have too much work to do.

Should be able to just mess around and play videogames with friends.  Cool.

[Darvi]

By the way, what does happen if the rock is made of salt? I know salt is solluble, but how much does that influence the experiment?

[Il Palazzo]

as it turns out that the stone sinks only after ALL of the ice has melted

Wait, what?  That implies the stone is the density of water.

I mean "is released from ice cube", or whatever was the wording in the task description. Meaning that there never exists a situation when there is some ice without the stone.

G-Flex. Your math holds, yes. But I think that your physics is faulty. The problem only states that the cube starts as floating, not that it has to stay afloat for the remainder of it's lifetime. It is bound to sink as it melts - there is just no other way.

[G-Flex]

G-Flex. Your math holds, yes. But I think that your physics is faulty. The problem only states that the cube starts as floating, not that it has to stay afloat for the remainder of it's lifetime. It is bound to sink as it melts - there is just no other way.

The question implies that the ice cube floats for the entirety of the time that the stone is attached to it. I already said this.

[Il Palazzo]

It would be only possible if the stone was less dense than water.

[Darvi]

as it turns out that the stone sinks only after ALL of the ice has melted

Wait, what?  That implies the stone is the density of water.

I mean "is released from ice cube", or whatever was the wording in the task description. Meaning that there never exists a situation when there is some ice without the stone.

Not quite. There can easily be some ice left if there's a big enough hole in it.

G-Flex. Your math holds, yes. But I think that your physics is faulty. The problem only states that the cube starts as floating, not that it has to stay afloat for the remainder of it's lifetime. It is bound to sink as it melts - there is just no other way.

The question implies that the ice cube floats for the entirety of the time that the stone is attached to it. I already said this.

Exactly. Else it would've start sinking before it got released.

It would be only possible if the stone was less dense than water.

Well water was never known for its intelligence.

[G-Flex]

Il Palazzo:

... What? No. Listen.

The ice cube, with the stone attached, remains floating. The stone only sinks when it becomes detached from the ice cube. None of this implies that the stone is less dense than water. If it were, it wouldn't sink at all!

The ice cube starts out floating, with the stone attached. Eventually, at some point, the stone becomes detached, yet there is still a finite volume of ice there.

[Leafsnail]

These questions aren't meant to be mean or tricky.  Although I'm sure we could do questions like that too .

[Aklyon]

Seriously, guys. Can't you just turn this into a different thread?

[Darvi]

Yeah, we should do that. And by "we" I mean somebody entirely different than me.

[Il Palazzo]

Yeah, we should do that. And by "we" I mean somebody entirely different than me.

Not sure if it's necessary, as I really need to go now, and who's gonna fight for the cause of C without me?
Last bit here:

Spoiler (click to show/hide)

Il Palazzo:

... What? No. Listen.

The ice cube, with the stone attached, remains floating. The stone only sinks when it becomes detached from the ice cube. None of this implies that the stone is less dense than water. If it were, it wouldn't sink at all!

The ice cube starts out floating, with the stone attached. Eventually, at some point, the stone becomes detached, yet there is still a finite volume of ice there.

Now now, where do you get the thing about there being some ice left, when the question explictly states that the stone gets released after ALL of it melts?

And my point is that the cube must sink at some point, as the diminishing ice cube is being dominated in its volume by the stone(which, as you've noticed must be denser than water, else it wouldn't sink).

If the question really wants you to assume that the cube floats all this time, then it's a silly question, from the physical point of view. But then, what do I know.

[Leafsnail]

What would the thread be called, though?  "Questions, puzzles and riddles" or something?