2) You take the following measurements for the distance a toy car travels in 10 seconds during each 5 trials: 157cm, 175cm, 162cm, 168cm, 187cm. What are the relative uncertainties of the distance and time measurements? Which measurement is the most uncertain?
· (157 + 175 + 162 + 168 + 187)/5 = 169.8
· 169.8 – 157 = 12.8
169.8 – 175 = 5.2
169.8 – 162 = 7.8
169.8 – 168 = 1.8
169.8 – 187 = 17.2 +
44.8 / 5 = 8.96
· 169.8 8.96cm absolute uncertainty
· (8.96/ 169.8)* 100 = 5.28% relative uncertainty cm.
· (.5/10)* 100 = 5% relative uncertainty sec.
· Conclusion: looking through the relative uncertainties, the distance measurement is the most uncertain at the percentage rate of 5.28%.
3)Calculate the average speed of the toy car. Use the weakest link rule to determine the uncertainty in the speed.
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