Posted by Anonymous on Sunday, May 2, 2010 at 9:43am.
The edge size of the box is
a = (0.041)^(1/3) = 0.345 m
and the area of a side is 0.1189 m^2
Pressure increases by a factor (273+181)/(273+20) = 1.5495
The new pressure will be 1.5495 atm
Multiply the final pressure (in Pascals) by the box side area, for the force in Newtons. I will leave that step up to you.
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