(adsbygoogle = window.adsbygoogle || []).push({}); 1. Data

Outer Diameter of tube=(64 +/- 2) and internal diameter= (47 +/- 1). Find cross-sectional area of tube and find percentage uncertainty.

2. Equations

3. The attempt at a solution

I got (Delta A)/A = (Delta D2-d2)/(D2-d2) where D2-d2=1887 +/- 198. Hence my A= 1500 and my delta A is 157.

But the correct answer is 1500 +/- 300. And percentage uncertainty is 20%.

Can anyone give me the equations of the uncertainties??? For example there is another question about z=2x2 + y. Can you give me the equation? Im still very blur about this topic.

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Random error calculation

**Physics Forums | Science Articles, Homework Help, Discussion**