## Significant figures in textbook Ex. 1.7 (p. 18) [ENDORSED]

Belicia Tang 1B
Posts: 32
Joined: Wed Sep 21, 2016 3:00 pm

### Significant figures in textbook Ex. 1.7 (p. 18)

In the final step calculation, there is a 2 in the denominator, so since that is only 1 sig fig, shouldn't the answer only be 1 sig fig, instead of 2?
Attachments Cindy Flores 2C
Posts: 27
Joined: Wed Sep 21, 2016 2:59 pm

### Re: Significant figures in textbook Ex. 1.7 (p. 18)

I'm pretty sure the 2 represents the fact that the number 1.0 x 10^-3 has to be doubled since that will get you the correct indeterminacy in velocity.

Franklin Kong 3D
Posts: 22
Joined: Fri Jul 22, 2016 3:00 am
Been upvoted: 1 time

### Re: Significant figures in textbook Ex. 1.7 (p. 18)  [ENDORSED]

The "2" means that the products of the numbers after it in the denominator have to be doubled. It is not a value that is obtained from the question itself, but rather from principle. Therefore, it is more like 2.000000000000... and the denominator is exactly doubled. Therefore, the "2" can be treated as a value with an infinite number of sig figs because it is exact.