Pressure & Force in a Beaker: Solutions

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Homework Help Overview

The problem involves calculating the downward force exerted on the bottom of a cylindrical beaker filled with water, focusing on the relationship between pressure, force, and area. The context is within fluid mechanics, specifically relating to pressure calculations in a static fluid.

Discussion Character

  • Exploratory, Assumption checking, Mixed

Approaches and Questions Raised

  • The original poster attempts to calculate the pressure at the bottom of the beaker using the hydrostatic pressure formula and then uses this to find the force. Some participants question the rounding of the final answer and the significance of significant figures in the context of the problem.

Discussion Status

Participants are discussing the calculations presented, with some suggesting that rounding may be the source of discrepancy between the original poster's result and the answer sheet. There is also a note about adherence to forum rules regarding post frequency.

Contextual Notes

There is mention of significant figures in the problem, indicating that the original poster is considering how to properly express their final answer based on the data provided. Additionally, there is a reference to the rules of the forum regarding post frequency, which may affect the flow of discussion.

Nellen2222
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Homework Statement




A 35 cm tall , 5 cm diamater cyldrical beaker is filled to its brim with water. whatis the donward force on the bottom of the beaker?

Homework Equations



p= po+ d*g*h
F= p*A
density of water is 1000

The Attempt at a Solution



p= 1.013*10^5 + 1000*9.8*0.35
p = 104,730 Pa

F= 104730 Pa * pi(0.025)^2 = 205.636 N

Answer sheet says 210 Newtons, and there are two sig digs in the question given. Either I did it wrong or I am supposed to round up. Let me know what is wrong please!
 
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Bump, anyone?
 
Nellen2222 said:
Answer sheet says 210 Newtons, and there are two sig digs in the question given. Either I did it wrong or I am supposed to round up. Let me know what is wrong please!
Looks OK to me. Round it up to two significant figures.

(And don't be bumping after just 30 minutes!)
 
Bumping is against the forum rules.

It's due to roundoff. The net force on the bottom is onlly d*g*h.
 

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