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**1. Homework Statement**

**A Cubic Box of volume 3.9*10^-2 meters cubed is filled with air at atmospheric pressure at 20 degrees C. The box is closed and heated to 180 degrees C. What is the net force on each side of the box?**

atmospheric pressure = 1 atm or 1.0*10^5 N/msquared

**2. Homework Equations**

Temperature K = C +273

P/T = P/T

P= F/A

**3. The Attempt at a Solution**

Okay i have no idea why i am getting this wrong. What i did was use P/T = P/T using the right temperatures and atm pressure in N/msquared for the pressure on the left side of the equation. on the right i am solving for P and used the 180+273 as the new temperature.

i got 154607.5 N/msquared

I then plugged that into P = F/A and cubed rooted the Volume given and squared that value to get area of one side of the box. and for the final answer got 17780 N.

the correct answer is 6400N