Posted by **joy** on Thursday, September 23, 2010 at 7:41pm.

A brass lid screws tightly onto a glass jar at 20 oC. To help open the jar, it can be placed into a bath of hot water. After this treatment, the temperature of the lid and the jar are both 60 oC. The inside diameter of the lid is 8.0 cm at 20 oC. Find the size of the gap (difference in radius) that develops by this procedure.

so radius - 4.0cm

is this the right equation for it?

delta L = alpha (initial Length) (delta Temp)

- physics -
**bobpursley**, Thursday, September 23, 2010 at 7:44pm
No. You need to work with area expansion, find the new diameter from area, then the change in area.

- physics -
**joy**, Thursday, September 23, 2010 at 7:46pm
:O our teacher never mentioned area expansion..

- physics -
**AF**, Tuesday, January 14, 2014 at 2:46pm
Dear Bobpursely

You're a terribly teacher.

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