Question

question
which of the following factors used in a dimensional analysis calculation have a finite number of significant figures (in other words, they are not exact numbers) that might limit the precision of the calculated value?
select the correct answer below:
a conversion factor for time of (60 min/1 hour)
a conversion factor for distance of (1000 m/1 km)
a measurement of speed equaling (27.7 km/hour)
none of the above

Explanation:

Step1: Understand exact and non - exact numbers

Exact numbers have an infinite number of significant figures. Conversion factors like 60 min/1 hour and 1000 m/1 km are definitions and are exact.

Step2: Analyze the speed measurement

A measurement of speed (27.7 km/hour) is a measured value. Measured values have a finite number of significant figures and can limit the precision of a calculated value.

Answer:

A measurement of speed equaling (27.7 km/hour)