Question

2. Eugenia wants to find out how fast she walked along the hiking trail that took her 1.5 h to complete (she didn’t have any way of measuring the time that passed during her walk any more precisely than that). She counted the number of steps with a pedometer and got 10000 steps. In order to calculate the distance she walked she estimated the length of her stride. She walked 10 steps three times at her usual rate and measured the distance with the measuring tape (the smallest division is 1 cm) and got 754cm, 748cm, 739cm. Find the length of her stride. What is the length of the hiking trail? What is the uncertainty and percent uncertainty in the hiking trail length?

3. What is the uncertainty and percent uncertainty in Eugenia’s time measurement? Is this an instrumental or random uncertainty?

4. Estimate Eugenia’s average speed. Compare the percent uncertainties in the time and distance measurements. Which measurement is more accurate? Determine the uncertainty Eugenia’s average speed.

Answer 1