A ball and plate are made of different materials. At some initial temperature, t

Question

A ball and plate are made of different materials. At some initial temperature, the ball sits in a hole cut into the plate but it doesn't fall through becuase the hole is slightly smaller than the ball. For which of the following situations will the ball fall through the hole if both are heated to a sufficiently high temperature?

A) An iron ball on a copper plate
B) A copper ball on a pyrex plate
C) An aluminum ball on a pyrex plate
D) A brass ball on a pyrex plate
E) An invar ball on a pyrex plate
F) A glass ball on a copper plate

Explanation / Answer

after having a look at melting point of all these I found that

for these cases ball will fall

A,B,D,F

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