Express your answers to problems in this section to the correct number of significant figures and proper units.
A marathon runner completes a 42.188-km course in 2 h , 30 min, and 12 s . There is an uncertainty of 25 m in the distance traveled and an uncertainty of 1 s in the elapsed time. (a) Calculate the percent uncertainty in the distance. (b) Calculate the uncertainty in the elapsed time. (c) What is the average speed in meters per second? (d) What is the uncertainty in the average speed?
Solution to 24PE
Step 1 of 4
We need to calculate the percent uncertainty in the distance and time and calculated the average speed and its uncertainty.