fluids
in the ans, they've also taken Patm(4A)-Patm(A) but Patm wont be different for both of themr right?
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@Gyro Gearloose
Note for OP
+solved @user1 @user2... to close the thread when your doubt is solved. Mention the users who helped you solve the doubt. This will be added to their stats.We're assuming h is really really small compared to the rate at which atmospheric pressure changes with altitude
Like, there isn't a significant difference at the top and bottom of a water bottle. It's not like you won't be able to breathe at ten feet off the ground.
yeah but then will we include 3Patm in the ans
no wait they multiplied Patm by their respective areas
Yes because Patm acts both upwards and downwards depending on the surface. Pascal's law
Yes, this is just balancing if forces.
*of
Total force in downward direction = total force in upward direction
ohh thats because the containeris open from both sides right
Closed from both sides you mean. If it was open, it couldn't be filled.
but then why is Patm diff
how is it acting if the container's closed
if it was open from the top side only then it would not have been different right?
shouldnt we just do (h)rhog(A) + N = mg
@Opt
The pressure at the bottom of the container must be more than the top by rho*gh, So, the pressure the bottom exerts is P_0 + rho g h no?
yes but in class when doing similar ques we didnt consider Patm at all...that would be wrong then right?
Sorry, had to go lunch but yes, what Lance said.
If it was a uniform cross sectional area, then it would have cancelled. Since the cross-sectional area is not the same at top and bottom, you can't ignore.
accha okk aur btw iss video me bhi Patm ko consider nhi kra ðŸ˜
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+solved @Opt
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