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

[Belicia Tang 1B]

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?

[Cindy Flores 2C]

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]

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.