Question

1. a student measures the length of an object and determines it to be 7.5 cm. which ruler did the student use? defend your answer. 8. for each of the volume devices below record the scale reading then the number of significant figures in the reading. 170 and 3 sig figs, 15.51 4 sig figs

Explanation:

Step1: Analyze ruler precision for 7.5 cm

A ruler with 1 - cm markings has an uncertainty of ±0.5 cm. When we measure a value like 7.5 cm, the measurement is made on a ruler with markings at every 1 cm, and we estimate the half - cm value. So the student used a ruler marked in centimeters.

Answer:

A ruler marked in centimeters.