anonymous
  • anonymous
An airtight box, having a lid of area 80.0 cm^2, is partially evacuated. Atmospheric pressure is 1.01 ´ 10^5 Pa. A force of 108 lb is required to pull the lid off the box. The pressure in the box was:
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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IrishBoy123
  • IrishBoy123
\(F = A .\Delta P\)
anonymous
  • anonymous
F = 108 lb ? A = 80cm^2 F/A = P ??
anonymous
  • anonymous
tried convert 108 lb to N

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anonymous
  • anonymous
I got 408.480 N
anonymous
  • anonymous
then I divide it by 80 cm^2
anonymous
  • anonymous
I got 480.408/80 = 6.0051
anonymous
  • anonymous
Idk if this is right pls help
IrishBoy123
  • IrishBoy123
http://www.wolframalpha.com/input/?i=solve%3A++%281.01+*+10%5E5%29+-+480.58%2F%2880+*+10%5E%28-4%29%29+ be careful with units :p victorian units to modern metric and cm to m
anonymous
  • anonymous
May I ask how did you come up with 80/10^4 ?
anonymous
  • anonymous
that will my last q thankyouuu btw
IrishBoy123
  • IrishBoy123
\(1m = 100cm\) \(.01m = 1cm\) \((.01m)^2 = (1cm)^2\)
anonymous
  • anonymous
so after that I'll use the Pgauge = Ptotal - Patmospheric ? sorry just clearing things up
IrishBoy123
  • IrishBoy123
sounds good!! as long as you are happy with it too :-)) ie getting the same answer.

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