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Thread: Cool Drink

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    Cool Drink

    A bartender gets an ice cube weighing 20 grams from an ice bucket and puts it into an insulated cup containing 100 grams of water at 20 degrees Celsius. Will all the ice melt? What will be the final temperature of the water?
    <font color=blue><font face="Script MT Bold"><big>Rob</big></font face=script></font color=blue>

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    Re: Cool Drink

    Not really sure how to do this one, but I think that <span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">it will melt and the final temperature will be about 16.6 degrees Celcius</span hide>

    StuartR

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    Re: Cool Drink

    You've got the first part right. The correct solution requires <span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold"> Heat of Fusion and Specific Heat Capacity et al</span hide>
    <font color=blue><font face="Script MT Bold"><big>Rob</big></font face=script></font color=blue>

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    Re: Cool Drink

    Yes, of course it does, I was being silly.

    StuartR

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    Re: Cool Drink

    Silly of me not realising you were being silly. Please carry on.
    <font color=blue><font face="Script MT Bold"><big>Rob</big></font face=script></font color=blue>

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    Re: Cool Drink

    <P ID="edit" class=small>(Edited by sdckapr on 30-Nov-06 15:20. Added Work)</P>I get <span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">3.3

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    Re: Cool Drink

    That's what I get. Have a cool drink on me, Steve.
    <font color=blue><font face="Script MT Bold"><big>Rob</big></font face=script></font color=blue>

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    Re: Cool Drink

    One must presume that the ice is <span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">at 0

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    Re: Cool Drink

    Absolutely, Alan. Thanks for pointing that out.
    <font color=blue><font face="Script MT Bold"><big>Rob</big></font face=script></font color=blue>

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    Re: Cool Drink

    An excellent point. I think that since the ice was from an ice bucket and not from a freezer that this seems a reasonable presumption.

    <span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">If the ice had come from a freezer we would first have to warm it 0

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    Re: Cool Drink

    This begs another puzzle. How cold would the ice have to be to freeze the contents of the glass?

    Alan

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    Re: Cool Drink

    As far as I calculate: <span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">It is impossible, the ice would have to be < "absolute zero" (I calc about -500

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    Re: Cool Drink

    I concur Steve. <span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">It was, in fact, a trick question (

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    Re: Cool Drink

    Just to be pedantic (and because I'm not clever/motivated enough to actually do the working out) - since no cup is 100 per cent insulated, the final temperature will (eventually) match the room temperature.

    Or, presuming that someone drinks the water, perhaps it will be nearer body temperature...
    Waggers
    If at first you do succeed, you&#39;ve probably missed something.

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    Re: Cool Drink

    Just to be even more pedantic, what if it's done outdoors?

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