Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Ice and water

  1. Mar 25, 2007 #1

    _anant

    User Avatar

    source:british physics olympiad
    :cool: a beaker of water has a piece of ice floating on its surface.When the ice melts,show that (by logic or by equations)
    1.that the water level remains unchanged.
    2.If a coin was initially kept above the ice block what chang will be there in answer to 1?
    :tongue2: 3.if the ice piece initially had an air cavity inside it how will the answer change?
    :tongue2: 4.if there is a miscible liquid TRAPPED inside the cavity then what will happen to the level of the water?:wink:
     
    _anant, Mar 25, 2007
  2. jcsd
    Phys.org - latest science and technology news stories on Phys.org
  3. Mar 25, 2007 #2

    Saketh

    User Avatar

    Think about the volume of water that was displaced before the ice melts, and the volume of water that was added after the ice melts (no more displacement).

    Once you figure this out, all the other situations are just variations on the simple theme.
     
    Saketh, Mar 25, 2007
  4. Mar 25, 2007 #3

    DaveC426913

    User Avatar
    Gold Member

    This has been answered elesewhere. Here's a diagram for Part 1:
    PF060917ice-water.gif
     
    DaveC426913, Mar 25, 2007
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook