# Homework Help: Uncertainty of measurements

1. Feb 8, 2017

### Diana Moceiparisi

1. The problem statement, all variables and given/known data
a) The equation governing the flow rate, , of a fluid under streamline conditions through a horizontal pipe of length l and radius r is:

where p is the pressure difference across the pipe and ƞ is the viscosity of the fluid.

Thus, a student conducted an experiment in order to determine the value of ƞ of water and finally states his result as and estimates the percentage uncertainties in his measurement of , p, l, and r as , , ,and respectively.

According to the instructor, although his arithmetic and the unit are correct, his statement is unsatisfactory. Thus, in order to improve the result presentation you are required to express his result with appropriate uncertainty.

2. Relevant equations

3. The attempt at a solution

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2. Feb 8, 2017

### haruspex

The "attempt at solution" image you uploaded appears only to say $\frac{dv}{dt}$.