You are part of a team in an engineering class that is working on a scale model
ID: 1772156 • Letter: Y
Question
You are part of a team in an engineering class that is working on a scale model of a new design for a life vest. You have been asked to find the mass of a piece of foam that will be used for flotation. Because the piece is too bulky to fit on your balance, you break it into two parts. You measure the mass of the first part as
133.0 ± 0.9 g
and the second part as
53.6 ± 0.2 g.
(a) What are the maximum and minimum values for the total mass you might reasonably report
(b) What is the best estimate for the total mass of the foam?
Explanation / Answer
As we have the given measurement in uncertainty form, we can calculate the maximum and minimum mass as
Max mass = (133 + 0.9) +(53.6 + 0.2) = 187.7
Min mass = (133 - 0.9) + (53.6 - 0.2) = 185.5
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