 #1
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Homework Statement
I experimented with standing waves on an oscillating string, and I was asked to calculate the absolute error of µ (linear mass per unit length). I don't know how to calculate it, so please help me.
I loaded 100g, 200g and 300g on the string. Below are tabulated data of the experiment.
Homework Equations
I know the basics of uncertainties, but in here it's kinda complicated as I don't know how to calculate the tension or speed error. I know this formula:
where c= speed, FT= tension and µ = linear mass per unit length
making µ the subject:
The Attempt at a Solution
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So the calculated tension for the 3 sets of masses are:
100g = 9.81*0.1=0.981
200g= 9.81*0.2=1.962
300g= 9.81*0.3=2.943
Speed:
100g= 39 m/s
200g= 54 m/s
300g= 72 m/s
µ values:
100g > 0.981/39^2 = 644.9*10^6 kg/m
200g > 1.962/54^2 = 672*10^6 kg/m
300g > 567.7*10^6 kg/m
Do i like average the tension and speed values and subtract the max and min number
So if i do that then:
average of tension = 1.962
2.9430.981=1.962 < this is the uncertainty?
average of c^2:
 averaging > 39+54+72/3 =55
 squaring > 55^2 = 3025
72^239^2=3663
This seems very wrong i don't really know what I'm doing.
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