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Unformatted text preview: 6. The magnitude F of the force required to pull the lid oﬀ is F = (po − pi )A, where po is the pressure
2
outside the box, pi is the pressure inside, and A is the area of the lid. Recalling that 1 N/m = 1 Pa, we
obtain
F
480 N
= 3.8 × 104 Pa .
= 1.0 × 105 Pa −
pi = po −
A
77 × 10−4 m2 ...
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 Fall '08
 SPRUNGER
 Physics, Force

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