What Are Some Suggestions for Checking an Answer and Identifying Mistakes?

  • Thread starter Thread starter kingboy
  • Start date Start date
Click For Summary

Discussion Overview

The discussion revolves around checking an answer related to the surface area of a cylinder and identifying mistakes in the calculations. Participants are exploring methods for verifying their work and correcting errors in mathematical reasoning.

Discussion Character

  • Homework-related, Technical explanation, Debate/contested

Main Points Raised

  • One participant asks for help in checking their answer and expresses uncertainty about their calculations.
  • Another participant points out that the inclusion of the area of the top surface of the cylinder is incorrect.
  • There is a suggestion that the total surface area should exclude the area of the top circle and instead consider a hemisphere on top.
  • A participant questions the derivation of a specific equation related to area and volume, indicating a need for clarification on the method used.
  • One participant acknowledges their mistake after receiving feedback, indicating a process of correction and learning.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the correct method for calculating the surface area, as there are differing views on whether to include the top circle or not. The discussion remains unresolved regarding the exact approach to take.

Contextual Notes

Limitations include potential misunderstandings of the problem setup and the need for clarification on the equations involved. The discussion does not fully resolve the mathematical steps necessary for the calculations.

kingboy
Messages
5
Reaction score
0
can you help me to check the answer ?pls give some suggestion ...i think someway is wrong...
 

Attachments

  • scan0004.jpg
    scan0004.jpg
    22.7 KB · Views: 523
  • scan0003.jpg
    scan0003.jpg
    15.9 KB · Views: 482
Physics news on Phys.org
hi kingboy! :smile:

you've included the area of the top surface of the cylinder :redface:
 
tiny-tim said:
hi kingboy! :smile:

you've included the area of the top surface of the cylinder :redface:

so that mean the total surface area need to -[tex]\pi[/tex]r^2(top circle)?
how about the method ? is that correct? because late need to dy/dx...

can someone help to correct or circle the wrong part?pls ...
 
Last edited:
hi kingboy! :smile:
kingboy said:
how about the method ? is that correct?
i don't understand how you got equation circle-2 :confused: …

you need to take the equations for A and V and to prove that A = 2V/r + 5πr2/3
 
kingboy said:
so that mean the total surface area need to -[tex]\pi[/tex]r^2(top circle)?
how about the method ? is that correct? because late need to dy/dx...

can someone help to correct or circle the wrong part?pls ...

Like tiny-tim pointed out you are including an extra circle. Think of your cylinder as having the top opened. Instead of that circle, you have your hemisphere on the top and not a flat circle.
 
o i know where i make mistake thank for helping ...
 

Similar threads

MHB Neuronal Dynamics Passive membrane equation
  • · Replies 1 ·
Replies
1
Views
3K
Programs Research paper reading suggestions
  • · Replies 7 ·
Replies
7
Views
1K
Undergrad How can we identify non-linear singular differential equation
  • · Replies 3 ·
Replies
3
Views
2K
Graduate Starting BDF iterations - suggestions?
  • · Replies 5 ·
Replies
5
Views
2K
Studying Is the suggestion for self-learning mathematics from books wrong?
  • · Replies 1 ·
Replies
1
Views
2K
Help with Time-Independent Perturbation Theory "Good" States Proof
  • · Replies 4 ·
Replies
4
Views
1K
Graduate A question about an 'extremal' surface
  • · Replies 7 ·
Replies
7
Views
3K
Studying What universities for studying Aerospace Engineering in UK?
  • · Replies 9 ·
Replies
9
Views
3K
How do I sketch a flow profile and solve for curl in vector calculus?
  • · Replies 8 ·
Replies
8
Views
2K
Finding an expression for the efficiency of a heat engine
  • · Replies 5 ·
Replies
5
Views
2K