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tigers4
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Homework Statement
A partially evacuated airtight container has a tight-fitting lid of surface area 78 cm2 and negligible mass. If the force required to remove the lid is 480 N and the outside atmospheric pressure is 1.01*10^5 Pa, what is the air pressure in the container before it is opened?
Homework Equations
p=F/A
The Attempt at a Solution
(1.01*10^5)*(78cm^2)+480N=Force needed to open lid
/area of lid=pressure needed to open lid...
I tried doing this but cannot get the write answer, please any help would be greatly appreciated