Question

if pressure inside a cylinder with a circular hatch is 2 atm and the radius of the entrance hatch is 12 inches, what force does the air exert on the hatch?

i cannot figure out if it would be
13,300.6 lb
24 lb
288 lb
1,300.6 lb
or 904.8 lb

Answer 1

force=pressure*PI*12^2
So the issue not given, is what the pressure inside relative to? Relative pressure? If so, no answers are correct, unless you assume atmospheric pressure outside is 1atm.

Now if the absolute pressure inside is 2 atm, and the outside pressure is 1 atm, then 13,300 lb is the best answer.

A very poorly stated question.