##
Homework

**Problem 1** Explain why a measuring instrument may not have sufficient
precision?
Answer
1

**Problem 2** Why do you think the word accuracy and precision are
so often?

Answer
2

**Problem 3** Calculate the curvature of a part.

In the following figure, a part to be measured is placed on two identical
precision rollers. The distance between two rollers is l mm, the height
from the platform to the bottom of the part is h mm, and the radius of
the rollers is r mm. Given l, h, r, calculate the radius of the part, R.

Answer
3