- #1
fattydq
- 79
- 0
I am asked "What is the area and it's approximate uncertainty of a circle of radius 3.8x10^4 cm?"
Now finding the area is easy. In my text it says that when you aren't GIVEN an uncertainty, you can assume it is a reasonable figure in the last digit, so in this problem I am assuming the original value is 32,000 cm +/- 5 cm. So far so good...
Now, how do I find the percent uncertainty of my final answer? Because I know the percent uncertainty in my 32,000 cm figure, but how does this come into play after squaring it and multiplying it by pi?
Now finding the area is easy. In my text it says that when you aren't GIVEN an uncertainty, you can assume it is a reasonable figure in the last digit, so in this problem I am assuming the original value is 32,000 cm +/- 5 cm. So far so good...
Now, how do I find the percent uncertainty of my final answer? Because I know the percent uncertainty in my 32,000 cm figure, but how does this come into play after squaring it and multiplying it by pi?