What is the uncertainty in the result above, in cm/s? As discussed in previous l

Question

What is the uncertainty in the result above, in cm/s?

As discussed in previous labs, uncertainties are propagated through calculations. Let us assume that these 8.5 cm, with the corresponding uncertainty, correspond to a trail of 13 spark marks, or 12 time intervals of 1/60 s. The speed is thus: 8.5 cm / 12 / 60s = -42. 5 cm /s . Let us assume for simplicity that the rate of spark production is very precise (i.e., the uncertainty associated with the time intervals being 1/60 s introduces a very small contribution to the total error). But the uncertainty associated with the use of a cheap plastic ruler should still be accounted for...What is the uncertainty in the result above, in cm/s?

Explanation / Answer

Uncertainty in length due to ruler=0.1cm

uncertainty in speed=0.1/(12/60)=0.5cm/s

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