College Physics Problem 1.12

A good-quality measuring tape can be off by 0.50 cm over a distance of 20 m. What is its percent uncertainty?


The percent uncertainty can be calculated by the uncertainty divided by the total measure. That is,


%uncertainty=frac{0.5 cm}{20 m}times frac{1m}{100 cm}times 100%


Therefore, the percent uncertainty is 0.025%.