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Metal ball and ring

  1. Sep 10, 2009 #1
    There is a metal ball and a metal ring , through which the metal ball can pass easily. But when the metal ball is heated , it can't pass through the metal ring. What will happen if metal ring is heated?(keeping metal ball normal)
  2. jcsd
  3. Sep 10, 2009 #2
    generally ring will expand! so ball can pass through
  4. Sep 10, 2009 #3
    but , the ring should also expand inside according to thermal expansion.
  5. Sep 10, 2009 #4


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    Science Advisor

    No. If the thermal expansion is uniform, it causes an uniform scaling up of all distances, including the inner diameter of the ring. In other words: The ring will keep it's proportions, like the inner radius / outer radius ratio. If the outer radius increases, the inner will do so as well.
  6. Sep 10, 2009 #5
    what is the clearance between the ball (radius) and ring (radius and thickness!) (both being at room temperature).
    Ball and ring made of which metal?
  7. Sep 10, 2009 #6
    it doesnt matter since they are both made of the same material.
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