Ocr practical paper question on concept

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Homework Help Overview

The discussion revolves around a practical question related to uncertainty in measurements involving disks, specifically focusing on achieving less than 0.5% uncertainty. The context appears to be an examination question from an OCR A-level physics paper.

Discussion Character

  • Assumption checking, Conceptual clarification

Approaches and Questions Raised

  • Participants are questioning the relationship between the number of disks and the resulting uncertainty, with one suggesting that adding more disks increases uncertainty. There is also a discussion about the implications of the scale's resolution on the uncertainty calculation.

Discussion Status

Some participants are exploring the assumptions about the disks being identical and the impact of the scale's resolution on uncertainty. There is a recognition of differing interpretations regarding the maximum number of disks that can be used to maintain the desired uncertainty level.

Contextual Notes

There is mention of an implicit assumption that the disks are identical, and the scale's resolution is noted as a factor influencing uncertainty. The discussion reflects a lack of consensus on the correct interpretation of the problem parameters.

bonbon22
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Homework Statement
problem statemetn below
Relevant Equations
volume = surface area of sphere * thickness
percentage uncertainty = absolute uncertainty/ value
244275

should n't it be a maximum number to achieve less than 0.5% uncertainty for the last question as you add more disks would there not be more uncertanity therefore as the number of disks for 0.5% is 9.5, 10 would give an unceranity of greater than 0.5% so it should be 9? the answer is 10.
 
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What's an ocr? Optical character recognition?
 
berkeman said:
What's an ocr? Optical character recognition?
Exam broad,, for a levels . IF you got free time friend would be grateful if you could help me out.
 
bonbon22 said:
should n't it be a maximum number to achieve less than 0.5% uncertainty for the last question as you add more disks would there not be more uncertanity therefore as the number of disks for 0.5% is 9.5, 10 would give an unceranity of greater than 0.5% so it should be 9? the answer is 10.
An implicit assumption going in is that the discs are identical.

The uncertainty is from the limited resolution of the scale: 0.2 grams. As specified, the scale's resolution is independent of how many discs you pile on. The more you pile on, the lower the uncertainty per disk.
 
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