Lesson: Using Significant FiguresPhysics
In this lesson, we will learn how to identify the precision of measured values in terms of significant figures and how to determine the precision of calculated values.
Sample Question Videos
Perform the following calculations and express your answer using the correct number of significant digits.
A woman has two bags weighing 13.5 lbf and one bag with a weight of 10.2 lbf. What is the total weight of the bags?
The force on an object is equal to its mass multiplied by its acceleration . If a wagon with mass 55 kg accelerates at a rate of 0.0255 m/s2, what is the force on the wagon?
A speedometer has an uncertainty of 3.0 km/h at a speed of 98 km/h.
What is the percent uncertainty of the speedometer?
Assuming that the percent uncertainty in the speedometer at 60 km/h is the same as at 98 km/h, what is maximum difference between the speed indicated by the speedometer and the speed that you might be moving at?
A person measures his or her heart rate by counting the number of beats in 40 s. beats are counted in s.
What is the person’s heart rate in beats per minute?
What is the uncertainty in the person’s heart rate, in beats per minute?